feat: enhance mobile responsiveness across calendar and contact components

- Added `isMobile` prop to `CalendarWeekView`, `EventDetailPopover`, `ContactDetail`, `ContactGroupDetail`, and `EmailComposer` components for improved mobile layout.
- Adjusted layout and styles in `CalendarWeekView` to display a 3-day view on mobile.
- Updated `EventDetailPopover` to adapt its size and layout for mobile devices.
- Modified `ContactDetail` and `ContactGroupDetail` to adjust padding and font sizes based on mobile view.
- Enhanced `EmailComposer` with mobile-friendly header and field layouts, including auto-saving draft functionality.
- Added confirmation dialog for unsaved changes when closing the email composer.
- Updated localization files to include new strings for draft management.

app/[locale]/calendar/page.tsx

@@ -1,8 +1,9 @@
 "use client";
 
-import { useState, useEffect, useCallback, useRef, useMemo } from "react";
+import { useState, useEffect, useCallback, useRef, useMemo, type TouchEvent as ReactTouchEvent } from "react";
 import { useRouter } from "@/i18n/navigation";
 import { useTranslations } from "next-intl";
+import { Plus } from "lucide-react";
 import {
   startOfMonth, endOfMonth, startOfWeek, endOfWeek,
   addMonths, subMonths, addWeeks, subWeeks, addDays, subDays,
@@ -14,6 +15,7 @@ import { useSettingsStore } from "@/stores/settings-store";
 import { useIdentityStore } from "@/stores/identity-store";
 import { toast } from "@/stores/toast-store";
 import { useIsMobile } from "@/hooks/use-media-query";
+import { Button } from "@/components/ui/button";
 import { CalendarToolbar } from "@/components/calendar/calendar-toolbar";
 import { CalendarMonthView } from "@/components/calendar/calendar-month-view";
 import { CalendarWeekView } from "@/components/calendar/calendar-week-view";
@@ -68,6 +70,9 @@ export default function CalendarPage() {
   const [detailAnchorRect, setDetailAnchorRect] = useState<DOMRect | null>(null);
   const hasFetched = useRef(false);
 
+  // Swipe navigation ref (handlers defined after navigatePrev/navigateNext)
+  const touchStartRef = useRef<{ x: number; y: number; time: number } | null>(null);
+
   useEffect(() => {
     if (!isAuthenticated) {
       router.push("/login");
@@ -155,10 +160,35 @@ export default function CalendarPage() {
     setMiniMonth(new Date());
   }, [setSelectedDate]);
 
+  // Swipe navigation handlers for mobile
+  const handleTouchStart = useCallback((e: ReactTouchEvent) => {
+    const touch = e.touches[0];
+    touchStartRef.current = { x: touch.clientX, y: touch.clientY, time: Date.now() };
+  }, []);
+
+  const handleTouchEnd = useCallback((e: ReactTouchEvent) => {
+    if (!touchStartRef.current || !isMobile) return;
+    const touch = e.changedTouches[0];
+    const dx = touch.clientX - touchStartRef.current.x;
+    const dy = touch.clientY - touchStartRef.current.y;
+    const elapsed = Date.now() - touchStartRef.current.time;
+    touchStartRef.current = null;
+
+    // Only trigger swipe if horizontal movement is dominant and fast enough
+    if (Math.abs(dx) > 60 && Math.abs(dx) > Math.abs(dy) * 1.5 && elapsed < 400) {
+      if (dx > 0) navigatePrev();
+      else navigateNext();
+    }
+  }, [isMobile, navigatePrev, navigateNext]);
+
   const handleSelectDate = useCallback((date: Date) => {
     setSelectedDate(date);
     setMiniMonth(date);
-  }, [setSelectedDate]);
+    // On mobile month view, tapping a date switches to day view
+    if (isMobile && viewMode === "month") {
+      setViewMode("day");
+    }
+  }, [setSelectedDate, isMobile, viewMode, setViewMode]);
 
   const handleMiniMonthChange = useCallback((date: Date) => {
     setMiniMonth(date);
@@ -549,6 +579,7 @@ export default function CalendarPage() {
               onSelectDate={handleSelectDate}
               onSelectEvent={handleSelectEvent}
               firstDayOfWeek={firstDayOfWeek}
+              isMobile={isMobile}
             />
           );
         case "week":
@@ -562,6 +593,7 @@ export default function CalendarPage() {
               onCreateAtTime={openCreateModal}
               firstDayOfWeek={firstDayOfWeek}
               timeFormat={timeFormat}
+              isMobile={isMobile}
             />
           );
         case "day":
@@ -573,6 +605,7 @@ export default function CalendarPage() {
               onSelectEvent={handleSelectEvent}
               onCreateAtTime={openCreateModal}
               timeFormat={timeFormat}
+              isMobile={isMobile}
             />
           );
         case "agenda":
@@ -620,9 +653,16 @@ export default function CalendarPage() {
           onCreateEvent={() => openCreateModal()}
           onImport={() => setShowImportModal(true)}
           isMobile={isMobile}
+          calendars={calendars}
+          selectedCalendarIds={selectedCalendarIds}
+          onToggleVisibility={toggleCalendarVisibility}
         />
 
-        <div className="flex flex-1 overflow-hidden">
+        <div
+          className="flex flex-1 overflow-hidden relative"
+          onTouchStart={handleTouchStart}
+          onTouchEnd={handleTouchEnd}
+        >
           {!isMobile && (
             <div className="w-60 border-r border-border p-3 overflow-y-auto flex-shrink-0">
               <MiniCalendar
@@ -642,6 +682,17 @@ export default function CalendarPage() {
           )}
 
           {renderView()}
+
+          {/* Floating Create Event Button (mobile) */}
+          {isMobile && (
+            <Button
+              onClick={() => openCreateModal()}
+              className="absolute bottom-4 right-4 z-40 h-14 w-14 rounded-full shadow-lg"
+              aria-label={t("events.create")}
+            >
+              <Plus className="h-6 w-6" />
+            </Button>
+          )}
         </div>
 
         {/* Mobile Bottom Navigation */}
@@ -663,6 +714,7 @@ export default function CalendarPage() {
           onRsvp={handleRsvpFromDetail}
           currentUserEmails={currentUserEmails}
           timeFormat={timeFormat}
+          isMobile={isMobile}
         />
       )}
 

app/[locale]/contacts/page.tsx

@@ -336,6 +336,7 @@ export default function ContactsPage() {
             onEdit={handleEditGroup}
             onDelete={handleDeleteGroup}
             onRemoveMember={handleRemoveGroupMember}
+            isMobile={isMobile}
             onSelectMember={(id) => {
               setSelectedContact(id);
               setActiveTab("all");
@@ -422,11 +423,20 @@ export default function ContactsPage() {
             contact={selectedContact}
             onEdit={handleEdit}
             onDelete={handleDelete}
+            isMobile={isMobile}
           />
         );
     }
   };
 
+  const showListPanel = !isMobile || view === "list";
+  const showRightPanel = !isMobile || view !== "list";
+
+  const mobileBackToList = () => {
+    setView("list");
+    clearSelection();
+  };
+
   return (
     <div className="flex h-screen bg-background">
       {!isMobile && (
@@ -437,112 +447,134 @@ export default function ContactsPage() {
 
       <div className="flex flex-col flex-1 min-w-0">
         <div className="flex flex-1 min-h-0">
-          <div className="w-80 border-r border-border flex flex-col flex-shrink-0">
+          {showListPanel && (
-        <div className="p-4 border-b border-border">
+            <div className={cn(
-          <div className="flex items-center justify-between">
+              "border-r border-border flex flex-col flex-shrink-0",
-            <Button
+              isMobile ? "w-full" : "w-80"
-              variant="ghost"
+            )}>
-              size="sm"
+              <div className={cn("p-4 border-b border-border", isMobile && "px-3 py-3")}>
-              onClick={() => router.push("/")}
+                <div className="flex items-center justify-between">
-              className="justify-start"
+                  <Button
-            >
+                    variant="ghost"
-              <ArrowLeft className="w-4 h-4 mr-2" />
+                    size="sm"
-              {t("back_to_mail")}
+                    onClick={() => router.push("/")}
-            </Button>
+                    className="justify-start"
-            <div className="flex gap-1">
+                  >
-              <Button
+                    <ArrowLeft className="w-4 h-4 mr-2" />
-                variant="ghost"
+                    {t("back_to_mail")}
-                size="icon"
+                  </Button>
-                className="h-8 w-8"
+                  <div className="flex gap-1">
-                onClick={() => setView("import")}
+                    <Button
-                title={t("import.title")}
+                      variant="ghost"
-              >
+                      size="icon"
-                <Upload className="w-4 h-4" />
+                      className="h-8 w-8"
-              </Button>
+                      onClick={() => setView("import")}
-              <Button
+                      title={t("import.title")}
-                variant="ghost"
+                    >
-                size="icon"
+                      <Upload className="w-4 h-4" />
-                className="h-8 w-8"
+                    </Button>
-                onClick={() => {
+                    <Button
-                  if (contacts.length > 0) {
+                      variant="ghost"
-                    exportContacts(contacts.filter(c => c.kind !== "group"));
+                      size="icon"
-                    toast.success(t("export.success", { count: contacts.filter(c => c.kind !== "group").length }));
+                      className="h-8 w-8"
-                  }
+                      onClick={() => {
-                }}
+                        if (contacts.length > 0) {
-                title={t("export.title")}
+                          exportContacts(contacts.filter(c => c.kind !== "group"));
-              >
+                          toast.success(t("export.success", { count: contacts.filter(c => c.kind !== "group").length }));
-                <Download className="w-4 h-4" />
+                        }
-              </Button>
+                      }}
+                      title={t("export.title")}
+                    >
+                      <Download className="w-4 h-4" />
+                    </Button>
+                  </div>
+                </div>
+              </div>
+
+              <div className="flex border-b border-border">
+                <button
+                  onClick={() => setActiveTab("all")}
+                  className={cn(
+                    "flex-1 flex items-center justify-center gap-1.5 px-3 py-2.5 text-sm font-medium transition-colors touch-manipulation",
+                    activeTab === "all"
+                      ? "border-b-2 border-primary text-primary"
+                      : "text-muted-foreground hover:text-foreground"
+                  )}
+                >
+                  <BookUser className="w-4 h-4" />
+                  {t("tabs.all")}
+                </button>
+                <button
+                  onClick={() => setActiveTab("groups")}
+                  className={cn(
+                    "flex-1 flex items-center justify-center gap-1.5 px-3 py-2.5 text-sm font-medium transition-colors touch-manipulation",
+                    activeTab === "groups"
+                      ? "border-b-2 border-primary text-primary"
+                      : "text-muted-foreground hover:text-foreground"
+                  )}
+                >
+                  <Users className="w-4 h-4" />
+                  {t("tabs.groups")}
+                  {groups.length > 0 && (
+                    <span className="text-xs px-1.5 py-0.5 rounded-full bg-muted">
+                      {groups.length}
+                    </span>
+                  )}
+                </button>
+              </div>
+
+              {activeTab === "all" ? (
+                <ContactList
+                  contacts={contacts}
+                  selectedContactId={selectedContactId}
+                  searchQuery={searchQuery}
+                  onSearchChange={setSearchQuery}
+                  onSelectContact={handleSelectContact}
+                  onCreateNew={handleCreateNew}
+                  onImport={() => setView("import")}
+                  supportsSync={supportsSync}
+                  className="flex-1"
+                  selectedContactIds={selectedContactIds}
+                  onToggleSelection={toggleContactSelection}
+                  onSelectAll={selectAllContacts}
+                  onClearSelection={clearSelection}
+                  onBulkDelete={handleBulkDelete}
+                  onBulkAddToGroup={handleBulkAddToGroup}
+                  onBulkExport={handleBulkExport}
+                />
+              ) : (
+                <ContactGroupList
+                  groups={groups}
+                  selectedGroupId={selectedGroupId}
+                  onSelectGroup={handleSelectGroup}
+                  onCreateGroup={handleCreateGroup}
+                  searchQuery={searchQuery}
+                  className="flex-1"
+                />
+              )}
             </div>
-          </div>
+          )}
-        </div>
 
-        <div className="flex border-b border-border">
+          {showRightPanel && (
-          <button
+            <div className="flex-1 min-w-0 flex flex-col">
-            onClick={() => setActiveTab("all")}
+              {isMobile && (
-            className={cn(
+                <div className="px-3 py-2 border-b border-border">
-              "flex-1 flex items-center justify-center gap-1.5 px-3 py-2.5 text-sm font-medium transition-colors",
+                  <Button
-              activeTab === "all"
+                    variant="ghost"
-                ? "border-b-2 border-primary text-primary"
+                    size="sm"
-                : "text-muted-foreground hover:text-foreground"
+                    onClick={mobileBackToList}
-            )}
+                    className="touch-manipulation"
-          >
+                  >
-            <BookUser className="w-4 h-4" />
+                    <ArrowLeft className="w-4 h-4 mr-2" />
-            {t("tabs.all")}
+                    {t("back_to_mail")}
-          </button>
+                  </Button>
-          <button
+                </div>
-            onClick={() => setActiveTab("groups")}
+              )}
-            className={cn(
+              <div className="flex-1 min-h-0">
-              "flex-1 flex items-center justify-center gap-1.5 px-3 py-2.5 text-sm font-medium transition-colors",
+                {renderRightPanel()}
-              activeTab === "groups"
+              </div>
-                ? "border-b-2 border-primary text-primary"
+            </div>
-                : "text-muted-foreground hover:text-foreground"
+          )}
-            )}
-          >
-            <Users className="w-4 h-4" />
-            {t("tabs.groups")}
-            {groups.length > 0 && (
-              <span className="text-xs px-1.5 py-0.5 rounded-full bg-muted">
-                {groups.length}
-              </span>
-            )}
-          </button>
-        </div>
-
-        {activeTab === "all" ? (
-          <ContactList
-            contacts={contacts}
-            selectedContactId={selectedContactId}
-            searchQuery={searchQuery}
-            onSearchChange={setSearchQuery}
-            onSelectContact={handleSelectContact}
-            onCreateNew={handleCreateNew}
-            onImport={() => setView("import")}
-            supportsSync={supportsSync}
-            className="flex-1"
-            selectedContactIds={selectedContactIds}
-            onToggleSelection={toggleContactSelection}
-            onSelectAll={selectAllContacts}
-            onClearSelection={clearSelection}
-            onBulkDelete={handleBulkDelete}
-            onBulkAddToGroup={handleBulkAddToGroup}
-            onBulkExport={handleBulkExport}
-          />
-        ) : (
-          <ContactGroupList
-            groups={groups}
-            selectedGroupId={selectedGroupId}
-            onSelectGroup={handleSelectGroup}
-            onCreateGroup={handleCreateGroup}
-            searchQuery={searchQuery}
-            className="flex-1"
-          />
-        )}
-      </div>
-
-          <div className="flex-1 min-w-0">
-            {renderRightPanel()}
-          </div>
         </div>
 
         {isMobile && (

app/[locale]/page.tsx

@@ -7,6 +7,7 @@ import { Sidebar } from "@/components/layout/sidebar";
 import { EmailList } from "@/components/email/email-list";
 import { EmailViewer } from "@/components/email/email-viewer";
 import { EmailComposer } from "@/components/email/email-composer";
+import type { ComposerDraftData } from "@/components/email/email-composer";
 import { ThreadConversationView } from "@/components/email/thread-conversation-view";
 import { MobileHeader, MobileViewerHeader } from "@/components/layout/mobile-header";
 import { ThreadGroup, Email } from "@/lib/jmap/types";
@@ -18,6 +19,7 @@ import { useIdentityStore } from "@/stores/identity-store";
 import { useUIStore } from "@/stores/ui-store";
 import { useDeviceDetection } from "@/hooks/use-media-query";
 import { useKeyboardShortcuts } from "@/hooks/use-keyboard-shortcuts";
+import { useConfirmDialog } from "@/hooks/use-confirm-dialog";
 import { debug } from "@/lib/debug";
 import { playNotificationSound } from "@/lib/notification-sound";
 import { cn } from "@/lib/utils";
@@ -28,12 +30,13 @@ import {
   EmailViewerErrorFallback,
   ComposerErrorFallback,
 } from "@/components/error";
+import { ConfirmDialog } from "@/components/ui/confirm-dialog";
 import { DragDropProvider } from "@/contexts/drag-drop-context";
 import { isFilterEmpty, activeFilterCount } from "@/lib/jmap/search-utils";
 import { WelcomeBanner } from "@/components/ui/welcome-banner";
 import { NavigationRail } from "@/components/layout/navigation-rail";
 import { Input } from "@/components/ui/input";
-import { Search, Filter, ChevronDown, X, Paperclip, Star, Mail, MailOpen, RotateCcw } from "lucide-react";
+import { Search, Filter, ChevronDown, X, Paperclip, Star, Mail, MailOpen, RotateCcw, PenSquare, PenLine } from "lucide-react";
 import { ResizeHandle } from "@/components/layout/resize-handle";
 import { Button } from "@/components/ui/button";
 
@@ -44,6 +47,8 @@ export default function Home() {
   const [showComposer, setShowComposer] = useState(false);
   const [composerMode, setComposerMode] = useState<'compose' | 'reply' | 'replyAll' | 'forward'>('compose');
   const [composerDraftText, setComposerDraftText] = useState("");
+  const [pendingDraft, setPendingDraft] = useState<ComposerDraftData | null>(null);
+  const { dialogProps: confirmDialogProps, confirm: confirmDialog } = useConfirmDialog();
   const [initialCheckDone, setInitialCheckDone] = useState(false);
   const [showShortcutsModal, setShowShortcutsModal] = useState(false);
   const [showAdvancedFields, setShowAdvancedFields] = useState(false);
@@ -170,6 +175,7 @@ export default function Home() {
     onCompose: () => {
       setComposerMode('compose');
       setShowComposer(true);
+      if (isMobile) setActiveView('viewer');
     },
     onFocusSearch: () => {
       const searchInput = document.querySelector('[data-search-input]') as HTMLInputElement;
@@ -422,16 +428,19 @@ export default function Home() {
     setComposerDraftText(draftText || "");
     setComposerMode('reply');
     setShowComposer(true);
+    if (isMobile) setActiveView('viewer');
   };
 
   const handleReplyAll = () => {
     setComposerMode('replyAll');
     setShowComposer(true);
+    if (isMobile) setActiveView('viewer');
   };
 
   const handleForward = () => {
     setComposerMode('forward');
     setShowComposer(true);
+    if (isMobile) setActiveView('viewer');
   };
 
   const handleDelete = async () => {
@@ -682,6 +691,11 @@ export default function Home() {
   const handleEmailSelect = async (email: { id: string }) => {
     if (!client || !email) return;
 
+    // If composing, suspend the composer (unmount will trigger onSaveState)
+    if (showComposer) {
+      setShowComposer(false);
+    }
+
     // Set loading state immediately (keep current email visible)
     setLoadingEmail(true);
 
@@ -751,18 +765,21 @@ export default function Home() {
     selectEmail(email);
     setComposerMode('reply');
     setShowComposer(true);
+    if (isMobile) setActiveView('viewer');
   };
 
   const handleConversationReplyAll = (email: Email) => {
     selectEmail(email);
     setComposerMode('replyAll');
     setShowComposer(true);
+    if (isMobile) setActiveView('viewer');
   };
 
   const handleConversationForward = (email: Email) => {
     selectEmail(email);
     setComposerMode('forward');
     setShowComposer(true);
+    if (isMobile) setActiveView('viewer');
   };
 
   const ToggleChip = ({ icon, label, value, onClick }: { icon: React.ReactNode; label: string; value: boolean | null; onClick: () => void }) => (
@@ -825,7 +842,10 @@ export default function Home() {
               onCompose={() => {
                 setComposerMode('compose');
                 setShowComposer(true);
-                if (isMobile) setSidebarOpen(false);
+                if (isMobile) {
+                  setSidebarOpen(false);
+                  setActiveView('viewer');
+                }
               }}
               onSidebarClose={() => setSidebarOpen(false)}
             />
@@ -847,7 +867,7 @@ export default function Home() {
           {/* Email List - full width on mobile, fixed width on tablet/desktop */}
           <div
             className={cn(
-              "flex flex-col h-full bg-background border-r border-border",
+              "relative flex flex-col h-full bg-background border-r border-border",
               // Mobile: full width, hidden when viewing email
               "max-md:flex-1 max-md:border-r-0",
               isMobile && activeView !== "list" && "max-md:hidden",
@@ -862,10 +882,6 @@ export default function Home() {
             {/* Mobile Header for List View */}
             <MobileHeader
               title={currentMailboxName}
-              onCompose={() => {
-                setComposerMode('compose');
-                setShowComposer(true);
-              }}
             />
 
             {/* Search Bar + Inline Advanced Filters */}
@@ -1105,6 +1121,21 @@ export default function Home() {
               />
             </ErrorBoundary>
             </div>
+
+            {/* Floating Compose Button (mobile) */}
+            {isMobile && (
+              <Button
+                onClick={() => {
+                  setComposerMode('compose');
+                  setShowComposer(true);
+                  setActiveView('viewer');
+                }}
+                className="absolute bottom-4 right-4 z-40 h-14 w-14 rounded-full shadow-lg"
+                aria-label={t('sidebar.compose')}
+              >
+                <PenSquare className="h-6 w-6" />
+              </Button>
+            )}
           </div>
 
           {/* Email list resize handle (desktop only) */}
@@ -1116,7 +1147,7 @@ export default function Home() {
             />
           )}
 
-          {/* Email Viewer - full screen on mobile, flex on tablet/desktop */}
+          {/* Email Viewer / Composer - full screen on mobile, flex on tablet/desktop */}
           <div
             className={cn(
               "flex flex-col h-full bg-background",
@@ -1127,6 +1158,82 @@ export default function Home() {
               "md:flex-1 md:min-w-0 md:relative"
             )}
           >
+            {/* Inline Composer - shown in viewer pane */}
+            {showComposer ? (
+              <ErrorBoundary
+                fallback={ComposerErrorFallback}
+                onReset={() => {
+                  setShowComposer(false);
+                  setComposerMode('compose');
+                }}
+              >
+                <EmailComposer
+                  mode={pendingDraft?.mode ?? composerMode}
+                  replyTo={pendingDraft?.replyTo ?? (selectedEmail ? {
+                    from: selectedEmail.from,
+                    to: selectedEmail.to,
+                    cc: selectedEmail.cc,
+                    subject: selectedEmail.subject,
+                    body: selectedEmail.bodyValues?.[selectedEmail.textBody?.[0]?.partId || '']?.value || selectedEmail.preview || '',
+                    receivedAt: selectedEmail.receivedAt
+                  } : undefined)}
+                  initialDraftText={composerDraftText}
+                  initialData={pendingDraft}
+                  onSaveState={(data) => setPendingDraft(data)}
+                  onSend={async (data) => {
+                    await handleEmailSend(data);
+                    setPendingDraft(null);
+                  }}
+                  onClose={() => {
+                    setShowComposer(false);
+                    setComposerMode('compose');
+                    setComposerDraftText("");
+                    setPendingDraft(null);
+                    if (isMobile) {
+                      setActiveView('list');
+                    }
+                  }}
+                  onDiscardDraft={(draftId) => {
+                    handleDiscardDraft(draftId);
+                    setPendingDraft(null);
+                  }}
+                />
+              </ErrorBoundary>
+            ) : (
+            <>
+            {/* Pending draft banner */}
+            {pendingDraft && (
+              <button
+                onClick={() => {
+                  setShowComposer(true);
+                  if (isMobile) setActiveView('viewer');
+                }}
+                className="flex items-center gap-3 px-4 py-2.5 bg-primary/10 border-b border-primary/20 hover:bg-primary/15 transition-colors cursor-pointer w-full text-left"
+              >
+                <PenLine className="w-4 h-4 text-primary shrink-0" />
+                <div className="flex-1 min-w-0">
+                  <span className="text-sm font-medium text-primary">{t('email_composer.continue_draft')}</span>
+                  {pendingDraft.subject && (
+                    <span className="text-xs text-muted-foreground ml-2 truncate">{pendingDraft.subject}</span>
+                  )}
+                </div>
+                <X
+                  className="w-4 h-4 text-muted-foreground hover:text-foreground shrink-0"
+                  onClick={async (e) => {
+                    e.stopPropagation();
+                    const confirmed = await confirmDialog({
+                      title: t('email_composer.discard_draft_title'),
+                      message: t('email_composer.discard_draft_confirm'),
+                      confirmText: t('email_composer.discard'),
+                      variant: "destructive",
+                    });
+                    if (confirmed) {
+                      setPendingDraft(null);
+                    }
+                  }}
+                />
+              </button>
+            )}
             {/* Mobile Conversation View - shown when thread is selected on mobile */}
             {isMobile && conversationThread ? (
               <ThreadConversationView
@@ -1187,6 +1294,8 @@ export default function Home() {
                 </ErrorBoundary>
               </>
             )}
+            </>
+            )}
           </div>
           </div>
 
@@ -1196,44 +1305,6 @@ export default function Home() {
           )}
         </div>
 
-        {/* Email Composer Modal */}
-        {showComposer && (
-          <div className="fixed inset-0 bg-black/50 flex items-center justify-center z-50 p-4 lg:p-0">
-            <div className={cn(
-              "w-full h-full lg:h-[600px] lg:max-w-3xl",
-              "max-lg:flex max-lg:flex-col"
-            )}>
-              <ErrorBoundary
-                fallback={ComposerErrorFallback}
-                onReset={() => {
-                  setShowComposer(false);
-                  setComposerMode('compose');
-                }}
-              >
-                <EmailComposer
-                  mode={composerMode}
-                  replyTo={selectedEmail ? {
-                    from: selectedEmail.from,
-                    to: selectedEmail.to,
-                    cc: selectedEmail.cc,
-                    subject: selectedEmail.subject,
-                    body: selectedEmail.bodyValues?.[selectedEmail.textBody?.[0]?.partId || '']?.value || selectedEmail.preview || '',
-                    receivedAt: selectedEmail.receivedAt
-                  } : undefined}
-                  initialDraftText={composerDraftText}
-                  onSend={handleEmailSend}
-                  onClose={() => {
-                    setShowComposer(false);
-                    setComposerMode('compose');
-                    setComposerDraftText("");
-                  }}
-                  onDiscardDraft={handleDiscardDraft}
-                />
-              </ErrorBoundary>
-            </div>
-          </div>
-        )}
-
         {/* Keyboard Shortcuts Modal */}
         <KeyboardShortcutsModal
           isOpen={showShortcutsModal}
@@ -1242,6 +1313,8 @@ export default function Home() {
 
         {/* Screen reader live region for dynamic status announcements */}
         <div className="sr-only" aria-live="polite" aria-atomic="true" id="sr-status" />
+
+        <ConfirmDialog {...confirmDialogProps} />
       </div>
     </DragDropProvider>
   );

components/calendar/calendar-day-view.tsx

@@ -17,6 +17,7 @@ interface CalendarDayViewProps {
   onSelectEvent: (event: CalendarEvent, anchorRect: DOMRect) => void;
   onCreateAtTime: (date: Date, endDate?: Date) => void;
   timeFormat?: "12h" | "24h";
+  isMobile?: boolean;
 }
 
 const HOUR_HEIGHT = 64;
@@ -29,6 +30,7 @@ export function CalendarDayView({
   onSelectEvent,
   onCreateAtTime,
   timeFormat = "24h",
+  isMobile,
 }: CalendarDayViewProps) {
   const t = useTranslations("calendar");
   const intlFormatter = useFormatter();
@@ -110,9 +112,12 @@ export function CalendarDayView({
 
   return (
     <div className="flex flex-col flex-1 overflow-hidden" role="grid" aria-label={intlFormatter.dateTime(selectedDate, { weekday: "long", month: "long", day: "numeric", year: "numeric" })}>
-      <div className="px-4 py-3 border-b border-border">
+      <div className={cn("px-4 py-3 border-b border-border", isMobile && "px-3 py-2")}>
-        <h3 className={cn("text-lg font-semibold", today && "text-primary")}>
+        <h3 className={cn("font-semibold", isMobile ? "text-base" : "text-lg", today && "text-primary")}>
-          {intlFormatter.dateTime(selectedDate, { weekday: "long", month: "long", day: "numeric", year: "numeric" })}
+          {isMobile
+            ? intlFormatter.dateTime(selectedDate, { weekday: "short", month: "short", day: "numeric" })
+            : intlFormatter.dateTime(selectedDate, { weekday: "long", month: "long", day: "numeric", year: "numeric" })
+          }
         </h3>
       </div>
 
@@ -138,15 +143,15 @@ export function CalendarDayView({
 
       <div ref={scrollRef} className="flex-1 overflow-y-auto">
         <div className="flex relative" style={{ height: 24 * HOUR_HEIGHT }}>
-          <div className="w-16 flex-shrink-0">
+          <div className={cn("flex-shrink-0", isMobile ? "w-10" : "w-16")}>
             {HOURS.map((h) => (
               <div
                 key={h}
-                className="relative text-muted-foreground text-right pr-3"
+                className="relative text-muted-foreground text-right pr-2"
                 style={{ height: HOUR_HEIGHT }}
               >
                 {h > 0 && (
-                  <span className="absolute top-0 right-3 -translate-y-1/2 text-xs leading-none">
+                  <span className={cn("absolute top-0 right-2 -translate-y-1/2 leading-none", isMobile ? "text-[10px]" : "text-xs")}>
                     {formatHour(h)}
                   </span>
                 )}

components/calendar/calendar-month-view.tsx

@@ -21,6 +21,7 @@ interface CalendarMonthViewProps {
   onSelectDate: (date: Date) => void;
   onSelectEvent: (event: CalendarEvent, anchorRect: DOMRect) => void;
   firstDayOfWeek?: number;
+  isMobile?: boolean;
 }
 
 export function CalendarMonthView({
@@ -30,6 +31,7 @@ export function CalendarMonthView({
   onSelectDate,
   onSelectEvent,
   firstDayOfWeek = 1,
+  isMobile,
 }: CalendarMonthViewProps) {
   const t = useTranslations("calendar");
   const intlFormatter = useFormatter();
@@ -125,22 +127,28 @@ export function CalendarMonthView({
     <div className="flex flex-col flex-1 overflow-hidden" role="grid" aria-label={intlFormatter.dateTime(selectedDate, { month: "long", year: "numeric" })}>
       <div className="grid grid-cols-7 border-b border-border" role="row">
         {dayHeaders.map((d) => (
-          <div key={d} role="columnheader" className="text-center text-xs font-medium text-muted-foreground py-2 border-r border-border last:border-r-0">
+          <div key={d} role="columnheader" className={cn(
-            {t(`days.${d}`)}
+            "text-center text-xs font-medium text-muted-foreground py-2 border-r border-border last:border-r-0",
+            isMobile && "py-1.5 text-[11px]"
+          )}>
+            {isMobile ? t(`days.${d}`).slice(0, 2) : t(`days.${d}`)}
           </div>
         ))}
       </div>
 
       <div className="flex-1 flex flex-col overflow-y-auto">
         {weeks.map((week, wi) => (
-          <div key={wi} className="grid grid-cols-7 flex-1 min-h-[100px] border-b border-border last:border-b-0" role="row">
+          <div key={wi} className={cn(
+            "grid grid-cols-7 flex-1 border-b border-border last:border-b-0",
+            isMobile ? "min-h-[52px]" : "min-h-[100px]"
+          )} role="row">
             {week.map((day) => {
               const inMonth = isSameMonth(day, selectedDate);
               const selected = isSameDay(day, selectedDate);
               const today = isToday(day);
               const key = format(day, "yyyy-MM-dd");
               const dayEvents = eventsByDate.get(key) || [];
-              const maxVisible = 3;
+              const maxVisible = isMobile ? 0 : 3;
               const fullDateLabel = intlFormatter.dateTime(day, { weekday: "long", month: "long", day: "numeric", year: "numeric" });
 
               return (
@@ -154,16 +162,18 @@ export function CalendarMonthView({
                   onDragLeave={handleCellDragLeave}
                   onDrop={(e) => handleCellDrop(e, day)}
                   className={cn(
-                    "border-r border-border last:border-r-0 p-1 cursor-pointer transition-colors",
+                    "border-r border-border last:border-r-0 p-1 cursor-pointer transition-colors touch-manipulation",
                     !inMonth && "bg-muted/30",
                     "hover:bg-muted/50",
+                    selected && isMobile && "bg-primary/10",
                     dropDayKey === key && "ring-2 ring-inset ring-primary bg-primary/10"
                   )}
                 >
                   <div className="flex items-center justify-center mb-0.5">
                     <span
                       className={cn(
-                        "inline-flex items-center justify-center w-6 h-6 text-xs rounded-full",
+                        "inline-flex items-center justify-center rounded-full",
+                        isMobile ? "w-7 h-7 text-xs" : "w-6 h-6 text-xs",
                         today && !selected && "bg-primary text-primary-foreground font-bold",
                         selected && "bg-primary text-primary-foreground font-bold",
                         !inMonth && !selected && !today && "text-muted-foreground/50",
@@ -173,26 +183,48 @@ export function CalendarMonthView({
                       {format(day, "d")}
                     </span>
                   </div>
-                  <div className="space-y-0.5">
+                  {isMobile ? (
-                    {dayEvents.slice(0, maxVisible).map((ev) => {
+                    dayEvents.length > 0 && (
-                      const calId = Object.keys(ev.calendarIds)[0];
+                      <div className="flex items-center justify-center gap-0.5 flex-wrap">
-                      return (
+                        {dayEvents.slice(0, 3).map((ev) => {
-                        <EventCard
+                          const calId = Object.keys(ev.calendarIds)[0];
-                          key={ev.id}
+                          const cal = calendarMap.get(calId);
-                          event={ev}
+                          const evColor = ev.color || cal?.color || "#3b82f6";
-                          calendar={calendarMap.get(calId)}
+                          return (
-                          variant="chip"
+                            <span
-                          onClick={(rect) => onSelectEvent(ev, rect)}
+                              key={ev.id}
-                          draggable
+                              className="w-1.5 h-1.5 rounded-full"
-                        />
+                              style={{ backgroundColor: evColor }}
-                      );
+                            />
-                    })}
+                          );
-                    {dayEvents.length > maxVisible && (
+                        })}
-                      <div className="text-[10px] text-muted-foreground px-1">
+                        {dayEvents.length > 3 && (
-                        {t("events.more", { count: dayEvents.length - maxVisible })}
+                          <span className="w-1.5 h-1.5 rounded-full bg-muted-foreground/40" />
+                        )}
                       </div>
-                    )}
+                    )
-                  </div>
+                  ) : (
+                    <div className="space-y-0.5">
+                      {dayEvents.slice(0, maxVisible).map((ev) => {
+                        const calId = Object.keys(ev.calendarIds)[0];
+                        return (
+                          <EventCard
+                            key={ev.id}
+                            event={ev}
+                            calendar={calendarMap.get(calId)}
+                            variant="chip"
+                            onClick={(rect) => onSelectEvent(ev, rect)}
+                            draggable
+                          />
+                        );
+                      })}
+                      {dayEvents.length > maxVisible && (
+                        <div className="text-[10px] text-muted-foreground px-1">
+                          {t("events.more", { count: dayEvents.length - maxVisible })}
+                        </div>
+                      )}
+                    </div>
+                  )}
                 </div>
               );
             })}

components/calendar/calendar-toolbar.tsx

@@ -1,11 +1,13 @@
 "use client";
 
+import { useState, useRef, useEffect } from "react";
 import { useTranslations, useFormatter } from "next-intl";
 import { Button } from "@/components/ui/button";
-import { ChevronLeft, ChevronRight, Plus, Upload } from "lucide-react";
+import { ChevronLeft, ChevronRight, Plus, Upload, CalendarDays } from "lucide-react";
 import { addDays, startOfWeek } from "date-fns";
 import { cn } from "@/lib/utils";
 import type { CalendarViewMode } from "@/stores/calendar-store";
+import type { Calendar } from "@/lib/jmap/types";
 
 interface CalendarToolbarProps {
   selectedDate: Date;
@@ -19,6 +21,9 @@ interface CalendarToolbarProps {
   isMobile?: boolean;
   firstDayOfWeek?: number;
   onNavigateBack?: () => void;
+  calendars?: Calendar[];
+  selectedCalendarIds?: string[];
+  onToggleVisibility?: (id: string) => void;
 }
 
 export function CalendarToolbar({
@@ -32,18 +37,39 @@ export function CalendarToolbar({
   onImport,
   isMobile,
   firstDayOfWeek = 1,
+  calendars,
+  selectedCalendarIds,
+  onToggleVisibility,
 }: CalendarToolbarProps) {
   const t = useTranslations("calendar");
   const formatter = useFormatter();
   const views: CalendarViewMode[] = ["month", "week", "day", "agenda"];
+  const [showCalendarDropdown, setShowCalendarDropdown] = useState(false);
+  const dropdownRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    if (!showCalendarDropdown) return;
+    function handleClickOutside(e: MouseEvent) {
+      if (dropdownRef.current && !dropdownRef.current.contains(e.target as Node)) {
+        setShowCalendarDropdown(false);
+      }
+    }
+    document.addEventListener("mousedown", handleClickOutside);
+    return () => document.removeEventListener("mousedown", handleClickOutside);
+  }, [showCalendarDropdown]);
 
   const getDateLabel = (): string => {
     switch (viewMode) {
       case "month":
-        return formatter.dateTime(selectedDate, { month: "long", year: "numeric" });
+        return isMobile
+          ? formatter.dateTime(selectedDate, { month: "short", year: "numeric" })
+          : formatter.dateTime(selectedDate, { month: "long", year: "numeric" });
       case "week": {
         const ws = startOfWeek(selectedDate, { weekStartsOn: firstDayOfWeek as 0 | 1 });
         const we = addDays(ws, 6);
+        if (isMobile) {
+          return `${formatter.dateTime(ws, { month: "short", day: "numeric" })} – ${formatter.dateTime(we, { day: "numeric" })}`;
+        }
         const sameMonth = ws.getMonth() === we.getMonth();
         if (sameMonth) {
           return `${formatter.dateTime(ws, { month: "short", day: "numeric" })} – ${formatter.dateTime(we, { day: "numeric" })}, ${we.getFullYear()}`;
@@ -51,30 +77,126 @@ export function CalendarToolbar({
         return `${formatter.dateTime(ws, { month: "short", day: "numeric" })} – ${formatter.dateTime(we, { month: "short", day: "numeric" })}, ${we.getFullYear()}`;
       }
       case "day":
-        return formatter.dateTime(selectedDate, { weekday: "long", month: "long", day: "numeric", year: "numeric" });
+        return isMobile
+          ? formatter.dateTime(selectedDate, { weekday: "short", month: "short", day: "numeric" })
+          : formatter.dateTime(selectedDate, { weekday: "long", month: "long", day: "numeric", year: "numeric" });
       case "agenda":
-        return formatter.dateTime(selectedDate, { month: "long", year: "numeric" });
+        return isMobile
+          ? formatter.dateTime(selectedDate, { month: "short", year: "numeric" })
+          : formatter.dateTime(selectedDate, { month: "long", year: "numeric" });
     }
   };
 
+  const [showViewDropdown, setShowViewDropdown] = useState(false);
+  const viewDropdownRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    if (!showViewDropdown) return;
+    function handleClickOutside(e: MouseEvent) {
+      if (viewDropdownRef.current && !viewDropdownRef.current.contains(e.target as Node)) {
+        setShowViewDropdown(false);
+      }
+    }
+    document.addEventListener("mousedown", handleClickOutside);
+    return () => document.removeEventListener("mousedown", handleClickOutside);
+  }, [showViewDropdown]);
+
   return (
-    <div className="flex items-center gap-2 px-4 py-3 border-b border-border flex-wrap">
+    <div className={cn("flex items-center gap-1.5 px-2 py-2 border-b border-border flex-wrap", !isMobile && "px-4 py-3 gap-2")}>
-      <div className="flex items-center gap-1">
+      <div className="flex items-center gap-0.5">
-        <button onClick={onPrev} className="p-1.5 rounded hover:bg-muted transition-colors" aria-label={t("nav_prev")}>
+        <button onClick={onPrev} className="p-2 rounded hover:bg-muted transition-colors touch-manipulation" aria-label={t("nav_prev")}>
           <ChevronLeft className="w-4 h-4" />
         </button>
-        <span className="text-sm font-medium min-w-[140px] text-center">
+        <span className={cn("text-sm font-medium text-center", isMobile ? "min-w-[80px]" : "min-w-[140px]")}>
           {getDateLabel()}
         </span>
-        <button onClick={onNext} className="p-1.5 rounded hover:bg-muted transition-colors" aria-label={t("nav_next")}>
+        <button onClick={onNext} className="p-2 rounded hover:bg-muted transition-colors touch-manipulation" aria-label={t("nav_next")}>
           <ChevronRight className="w-4 h-4" />
         </button>
       </div>
 
-      <Button variant="outline" size="sm" onClick={onToday}>
+      <Button variant="outline" size="sm" onClick={onToday} className="touch-manipulation">
         {t("views.today")}
       </Button>
 
+      {isMobile && calendars && selectedCalendarIds && onToggleVisibility && (
+        <div className="relative" ref={dropdownRef}>
+          <Button
+            variant="outline"
+            size="sm"
+            onClick={() => setShowCalendarDropdown((v) => !v)}
+            aria-label={t("my_calendars")}
+            className="touch-manipulation"
+          >
+            <CalendarDays className="w-4 h-4" />
+          </Button>
+          {showCalendarDropdown && (
+            <div className="absolute top-full right-0 mt-1 z-50 bg-popover border border-border rounded-lg shadow-lg p-2 min-w-[180px]">
+              <h3 className="text-xs font-medium text-muted-foreground uppercase tracking-wider mb-2 px-1">
+                {t("my_calendars")}
+              </h3>
+              <div className="space-y-0.5">
+                {calendars.map((cal) => {
+                  const isVisible = selectedCalendarIds.includes(cal.id);
+                  const color = cal.color || "#3b82f6";
+                  return (
+                    <button
+                      key={cal.id}
+                      onClick={() => onToggleVisibility(cal.id)}
+                      className={cn(
+                        "flex items-center gap-2 w-full px-2 py-2 rounded-md text-sm transition-colors duration-150 touch-manipulation",
+                        "hover:bg-muted"
+                      )}
+                    >
+                      <span
+                        className={cn(
+                          "w-3.5 h-3.5 rounded-sm border-2 flex-shrink-0 transition-colors",
+                          isVisible ? "border-transparent" : "border-muted-foreground/40 bg-transparent"
+                        )}
+                        style={isVisible ? { backgroundColor: color, borderColor: color } : undefined}
+                      />
+                      <span className={cn("truncate", !isVisible && "text-muted-foreground")}>
+                        {cal.name}
+                      </span>
+                    </button>
+                  );
+                })}
+              </div>
+            </div>
+          )}
+        </div>
+      )}
+
+      {isMobile && (
+        <div className="relative" ref={viewDropdownRef}>
+          <Button
+            variant="outline"
+            size="sm"
+            onClick={() => setShowViewDropdown((v) => !v)}
+            className="touch-manipulation capitalize text-xs"
+          >
+            {t(`views.${viewMode}`)}
+            <ChevronLeft className="w-3 h-3 ml-1 rotate-[-90deg]" />
+          </Button>
+          {showViewDropdown && (
+            <div className="absolute top-full right-0 mt-1 z-50 bg-popover border border-border rounded-lg shadow-lg p-1 min-w-[120px]">
+              {views.map((v) => (
+                <button
+                  key={v}
+                  onClick={() => { onViewModeChange(v); setShowViewDropdown(false); }}
+                  className={cn(
+                    "flex items-center w-full px-3 py-2 rounded-md text-sm transition-colors touch-manipulation",
+                    v === viewMode ? "bg-primary text-primary-foreground" : "hover:bg-muted text-foreground"
+                  )}
+                >
+                  {t(`views.${v}`)}
+                </button>
+              ))}
+            </div>
+          )}
+        </div>
+      )}
+
       <div className="flex-1" />
 
       {!isMobile && (
@@ -97,17 +219,19 @@ export function CalendarToolbar({
         </div>
       )}
 
-      {onImport && (
+      {onImport && !isMobile && (
         <Button variant="outline" size="sm" onClick={onImport}>
           <Upload className="w-4 h-4 mr-1" />
-          {!isMobile && t("import.title")}
+          {t("import.title")}
         </Button>
       )}
 
-      <Button size="sm" onClick={onCreateEvent}>
+      {!isMobile && (
-        <Plus className="w-4 h-4 mr-1" />
+        <Button size="sm" onClick={onCreateEvent}>
-        {!isMobile && t("events.create")}
+          <Plus className="w-4 h-4 mr-1" />
-      </Button>
+          {t("events.create")}
+        </Button>
+      )}
     </div>
   );
 }

components/calendar/calendar-week-view.tsx

@@ -21,6 +21,7 @@ interface CalendarWeekViewProps {
   onCreateAtTime: (date: Date, endDate?: Date) => void;
   firstDayOfWeek?: number;
   timeFormat?: "12h" | "24h";
+  isMobile?: boolean;
 }
 
 const HOUR_HEIGHT = 60;
@@ -35,6 +36,7 @@ export function CalendarWeekView({
   onCreateAtTime,
   firstDayOfWeek = 1,
   timeFormat = "24h",
+  isMobile,
 }: CalendarWeekViewProps) {
   const t = useTranslations("calendar");
   const intlFormatter = useFormatter();
@@ -42,9 +44,13 @@ export function CalendarWeekView({
   const weekStart = (firstDayOfWeek === 0 ? 0 : 1) as 0 | 1;
 
   const weekDays = useMemo(() => {
+    if (isMobile) {
+      // Show 3-day window centered on selected date
+      return Array.from({ length: 3 }, (_, i) => addDays(selectedDate, i - 1));
+    }
     const start = startOfWeek(selectedDate, { weekStartsOn: weekStart });
     return Array.from({ length: 7 }, (_, i) => addDays(start, i));
-  }, [selectedDate, weekStart]);
+  }, [selectedDate, weekStart, isMobile]);
 
   const calendarMap = useMemo(() => {
     const map = new Map<string, Calendar>();
@@ -132,14 +138,16 @@ export function CalendarWeekView({
     return format(new Date(2000, 0, 1, h), "HH:mm");
   };
 
+  const colCount = isMobile ? 3 : 7;
+
   return (
     <div className="flex flex-col flex-1 overflow-hidden" role="grid" aria-label={t("views.week")}>
       {hasAllDay && (
         <div className="flex border-b border-border">
-          <div className="w-14 flex-shrink-0 text-[10px] text-muted-foreground p-1 text-right">
+          <div className={cn("flex-shrink-0 text-[10px] text-muted-foreground p-1 text-right", isMobile ? "w-10" : "w-14")}>
             {t("events.all_day")}
           </div>
-          <div className="flex-1 grid grid-cols-7 gap-px bg-border">
+          <div className={cn("flex-1 grid gap-px bg-border", isMobile ? "grid-cols-3" : "grid-cols-7")}>
             {weekDays.map((day) => {
               const key = format(day, "yyyy-MM-dd");
               const dayAllDay = allDayEvents.get(key) || [];
@@ -165,8 +173,8 @@ export function CalendarWeekView({
       )}
 
       <div className="flex border-b border-border" role="row">
-        <div className="w-14 flex-shrink-0" />
+        <div className={cn("flex-shrink-0", isMobile ? "w-10" : "w-14")} />
-        <div className="flex-1 grid grid-cols-7 border-l border-border">
+        <div className={cn("flex-1 border-l border-border", isMobile ? "grid grid-cols-3" : "grid grid-cols-7")}>
           {weekDays.map((day) => {
             const todayCol = isToday(day);
             const selected = isSameDay(day, selectedDate);
@@ -178,7 +186,7 @@ export function CalendarWeekView({
                 role="columnheader"
                 aria-label={fullLabel}
                 className={cn(
-                  "text-center py-2 text-sm border-r border-border last:border-r-0 transition-colors",
+                  "text-center py-2 text-sm border-r border-border last:border-r-0 transition-colors touch-manipulation",
                   "hover:bg-muted/50",
                   todayCol && "font-bold",
                 )}
@@ -201,7 +209,7 @@ export function CalendarWeekView({
 
       <div ref={scrollRef} className="flex-1 overflow-y-auto">
         <div className="flex relative" style={{ height: 24 * HOUR_HEIGHT }}>
-          <div className="w-14 flex-shrink-0">
+          <div className={cn("flex-shrink-0", isMobile ? "w-10" : "w-14")}>
             {HOURS.map((h) => (
               <div
                 key={h}
@@ -209,7 +217,7 @@ export function CalendarWeekView({
                 style={{ height: HOUR_HEIGHT }}
               >
                 {h > 0 && (
-                  <span className="absolute top-0 right-2 -translate-y-1/2 text-[10px] leading-none">
+                  <span className={cn("absolute top-0 right-2 -translate-y-1/2 leading-none", isMobile ? "text-[9px]" : "text-[10px]")}>
                     {formatHour(h)}
                   </span>
                 )}
@@ -217,7 +225,7 @@ export function CalendarWeekView({
             ))}
           </div>
 
-          <div className="flex-1 grid grid-cols-7 border-l border-border relative">
+          <div className={cn("flex-1 border-l border-border relative", isMobile ? "grid grid-cols-3" : "grid grid-cols-7")}>
             {weekDays.map((day) => {
               const key = format(day, "yyyy-MM-dd");
               const dayEvents = timedEvents.get(key) || [];

components/calendar/event-detail-popover.tsx

@@ -9,6 +9,7 @@ import {
   Pencil, Trash2, Copy, Send, Check,
 } from "lucide-react";
 import { format, parseISO } from "date-fns";
+import { cn } from "@/lib/utils";
 import type { CalendarEvent, Calendar, CalendarParticipant } from "@/lib/jmap/types";
 import { parseDuration, getEventColor } from "./event-card";
 import {
@@ -30,6 +31,7 @@ interface EventDetailPopoverProps {
   onRsvp?: (status: CalendarParticipant["participationStatus"]) => void;
   currentUserEmails?: string[];
   timeFormat?: "12h" | "24h";
+  isMobile?: boolean;
 }
 
 const POPOVER_WIDTH = 360;
@@ -119,6 +121,7 @@ export function EventDetailPopover({
   onRsvp,
   currentUserEmails = [],
   timeFormat = "24h",
+  isMobile,
 }: EventDetailPopoverProps) {
   const t = useTranslations("calendar");
   const popoverRef = useRef<HTMLDivElement>(null);
@@ -249,8 +252,16 @@ export function EventDetailPopover({
       ref={popoverRef}
       role="dialog"
       aria-label={event.title || t("events.no_title")}
-      className="fixed z-[60] bg-background border border-border rounded-lg shadow-xl overflow-hidden transition-[opacity,transform] duration-150 ease-out"
+      className={cn(
-      style={{
+        "fixed z-[60] bg-background border border-border shadow-xl overflow-hidden transition-[opacity,transform] duration-150 ease-out",
+        isMobile
+          ? "inset-0 rounded-none flex flex-col"
+          : "rounded-lg"
+      )}
+      style={isMobile ? {
+        opacity: 1,
+        transform: "none",
+      } : {
         width: POPOVER_WIDTH,
         maxHeight: MAX_HEIGHT,
         top: position?.top ?? -9999,
@@ -301,7 +312,10 @@ export function EventDetailPopover({
       </div>
 
       {/* Content */}
-      <div className="px-4 py-2 space-y-2.5 overflow-y-auto" style={{ maxHeight: MAX_HEIGHT - 140 }}>
+      <div className={cn(
+        "px-4 py-2 space-y-2.5 overflow-y-auto",
+        isMobile ? "flex-1" : ""
+      )} style={isMobile ? undefined : { maxHeight: MAX_HEIGHT - 140 }}>
         {/* Date & Time */}
         <div className="flex items-start gap-2.5">
           <Clock className="w-4 h-4 text-muted-foreground mt-0.5 flex-shrink-0" />

components/contacts/contact-detail.tsx

@@ -13,10 +13,11 @@ interface ContactDetailProps {
   contact: ContactCard | null;
   onEdit: () => void;
   onDelete: () => void;
+  isMobile?: boolean;
   className?: string;
 }
 
-export function ContactDetail({ contact, onEdit, onDelete, className }: ContactDetailProps) {
+export function ContactDetail({ contact, onEdit, onDelete, isMobile, className }: ContactDetailProps) {
   const t = useTranslations("contacts");
 
   if (!contact) {
@@ -38,23 +39,23 @@ export function ContactDetail({ contact, onEdit, onDelete, className }: ContactD
 
   return (
     <div className={cn("flex flex-col h-full overflow-y-auto", className)}>
-      <div className="px-6 py-6 border-b border-border">
+      <div className={cn("border-b border-border", isMobile ? "px-4 py-4" : "px-6 py-6")}>
-        <div className="flex items-start justify-between">
+        <div className={cn("flex gap-4", isMobile ? "flex-col" : "items-start justify-between")}>
           <div className="flex items-center gap-4">
-            <Avatar name={name} email={email} size="lg" />
+            <Avatar name={name} email={email} size={isMobile ? "md" : "lg"} />
-            <div>
+            <div className="min-w-0 flex-1">
-              <h2 className="text-xl font-semibold">{name || "—"}</h2>
+              <h2 className={cn("font-semibold truncate", isMobile ? "text-lg" : "text-xl")}>{name || "—"}</h2>
               {orgs.length > 0 && orgs[0].name && (
-                <p className="text-sm text-muted-foreground">{orgs[0].name}</p>
+                <p className="text-sm text-muted-foreground truncate">{orgs[0].name}</p>
               )}
             </div>
           </div>
           <div className="flex gap-2">
-            <Button variant="outline" size="sm" onClick={onEdit}>
+            <Button variant="outline" size="sm" onClick={onEdit} className="touch-manipulation">
               <Pencil className="w-4 h-4 mr-1" />
               {t("form.edit_title")}
             </Button>
-            <Button variant="outline" size="sm" onClick={onDelete} className="text-red-600 dark:text-red-400 hover:text-red-700 dark:hover:text-red-300 hover:bg-red-50 dark:hover:bg-red-950">
+            <Button variant="outline" size="sm" onClick={onDelete} className="text-red-600 dark:text-red-400 hover:text-red-700 dark:hover:text-red-300 hover:bg-red-50 dark:hover:bg-red-950 touch-manipulation">
               <Trash2 className="w-4 h-4" />
             </Button>
           </div>
@@ -72,10 +73,13 @@ export function ContactDetail({ contact, onEdit, onDelete, className }: ContactD
                 {e.contexts && (
                   <ContextBadge contexts={e.contexts} />
                 )}
-                <div className="flex items-center gap-0.5 opacity-0 group-hover:opacity-100 transition-opacity">
+                <div className={cn(
+                  "flex items-center gap-0.5 transition-opacity",
+                  isMobile ? "opacity-100" : "opacity-0 group-hover:opacity-100"
+                )}>
                   <a
                     href={`mailto:${e.address}`}
-                    className="p-1 rounded hover:bg-muted transition-colors"
+                    className="p-1.5 rounded hover:bg-muted transition-colors touch-manipulation"
                     title={t("detail.compose_email")}
                     aria-label={t("detail.compose_email")}
                   >
@@ -90,7 +94,7 @@ export function ContactDetail({ contact, onEdit, onDelete, className }: ContactD
                         toast.error(t("detail.copy_failed"));
                       }
                     }}
-                    className="p-1 rounded hover:bg-muted transition-colors"
+                    className="p-1.5 rounded hover:bg-muted transition-colors touch-manipulation"
                     title={t("detail.copy_email")}
                     aria-label={t("detail.copy_email")}
                   >
@@ -121,7 +125,10 @@ export function ContactDetail({ contact, onEdit, onDelete, className }: ContactD
                       toast.error(t("detail.copy_failed"));
                     }
                   }}
-                  className="p-1 rounded hover:bg-muted transition-colors opacity-0 group-hover:opacity-100"
+                  className={cn(
+                    "p-1.5 rounded hover:bg-muted transition-colors touch-manipulation",
+                    isMobile ? "opacity-100" : "opacity-0 group-hover:opacity-100"
+                  )}
                   title={t("detail.copy_phone")}
                   aria-label={t("detail.copy_phone")}
                 >

components/contacts/contact-group-detail.tsx

@@ -15,6 +15,7 @@ interface ContactGroupDetailProps {
   onDelete: () => void;
   onRemoveMember: (memberId: string) => void;
   onSelectMember: (id: string) => void;
+  isMobile?: boolean;
   className?: string;
 }
 
@@ -25,6 +26,7 @@ export function ContactGroupDetail({
   onDelete,
   onRemoveMember,
   onSelectMember,
+  isMobile,
   className,
 }: ContactGroupDetailProps) {
   const t = useTranslations("contacts");
@@ -32,21 +34,21 @@ export function ContactGroupDetail({
 
   return (
     <div className={cn("flex flex-col h-full overflow-y-auto", className)}>
-      <div className="px-6 py-6 border-b border-border">
+      <div className={cn("border-b border-border", isMobile ? "px-4 py-4" : "px-6 py-6")}>
-        <div className="flex items-start justify-between">
+        <div className={cn("flex gap-4", isMobile ? "flex-col" : "items-start justify-between")}>
           <div className="flex items-center gap-4">
-            <div className="w-14 h-14 rounded-full bg-primary/10 flex items-center justify-center">
+            <div className={cn("rounded-full bg-primary/10 flex items-center justify-center", isMobile ? "w-12 h-12" : "w-14 h-14")}>
-              <Users className="w-7 h-7 text-primary" />
+              <Users className={cn("text-primary", isMobile ? "w-6 h-6" : "w-7 h-7")} />
             </div>
             <div>
-              <h2 className="text-xl font-semibold">{groupName}</h2>
+              <h2 className={cn("font-semibold", isMobile ? "text-lg" : "text-xl")}>{groupName}</h2>
               <p className="text-sm text-muted-foreground">
                 {t("groups.member_count", { count: members.length })}
               </p>
             </div>
           </div>
           <div className="flex gap-2">
-            <Button variant="outline" size="sm" onClick={onEdit}>
+            <Button variant="outline" size="sm" onClick={onEdit} className="touch-manipulation">
               <Pencil className="w-4 h-4 mr-1" />
               {t("form.edit_title")}
             </Button>
@@ -54,7 +56,7 @@ export function ContactGroupDetail({
               variant="outline"
               size="sm"
               onClick={onDelete}
-              className="text-red-600 dark:text-red-400 hover:text-red-700 dark:hover:text-red-300 hover:bg-red-50 dark:hover:bg-red-950"
+              className="text-red-600 dark:text-red-400 hover:text-red-700 dark:hover:text-red-300 hover:bg-red-50 dark:hover:bg-red-950 touch-manipulation"
             >
               <Trash2 className="w-4 h-4" />
             </Button>
@@ -95,7 +97,10 @@ export function ContactGroupDetail({
                   <Button
                     variant="ghost"
                     size="icon"
-                    className="h-8 w-8 opacity-0 group-hover:opacity-100 transition-opacity"
+                    className={cn(
+                      "h-8 w-8 transition-opacity",
+                      isMobile ? "opacity-100" : "opacity-0 group-hover:opacity-100"
+                    )}
                     onClick={() => onRemoveMember(member.id)}
                   >
                     <UserMinus className="w-4 h-4 text-muted-foreground" />

components/email/email-composer.tsx

@@ -2,11 +2,9 @@
 
 import React, { useState, useEffect, useRef, useCallback } from "react";
 import { useFocusTrap } from "@/hooks/use-focus-trap";
-import { useConfirmDialog } from "@/hooks/use-confirm-dialog";
 import { useTranslations } from "next-intl";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
-import { ConfirmDialog } from "@/components/ui/confirm-dialog";
 import { X, Paperclip, Send, Save, Check, Loader2, AlertCircle, FileText, BookmarkPlus } from "lucide-react";
 import { cn, formatFileSize } from "@/lib/utils";
 import { debug } from "@/lib/debug";
@@ -21,6 +19,21 @@ import { TemplatePicker } from "@/components/templates/template-picker";
 import { TemplateForm } from "@/components/templates/template-form";
 import type { EmailTemplate } from "@/lib/template-types";
 
+export interface ComposerDraftData {
+  to: string;
+  cc: string;
+  bcc: string;
+  subject: string;
+  body: string;
+  showCc: boolean;
+  showBcc: boolean;
+  selectedIdentityId: string | null;
+  subAddressTag: string;
+  mode: 'compose' | 'reply' | 'replyAll' | 'forward';
+  replyTo?: EmailComposerProps['replyTo'];
+  draftId: string | null;
+}
+
 interface EmailComposerProps {
   onSend?: (data: {
     to: string[];
@@ -35,8 +48,10 @@ interface EmailComposerProps {
   }) => void | Promise<void>;
   onClose?: () => void;
   onDiscardDraft?: (draftId: string) => void;
+  onSaveState?: (data: ComposerDraftData) => void;
   className?: string;
   initialDraftText?: string;
+  initialData?: ComposerDraftData | null;
   mode?: 'compose' | 'reply' | 'replyAll' | 'forward';
   replyTo?: {
     from?: { email?: string; name?: string }[];
@@ -52,8 +67,10 @@ export function EmailComposer({
   onSend,
   onClose,
   onDiscardDraft,
+  onSaveState,
   className,
   initialDraftText,
+  initialData,
   mode = 'compose',
   replyTo
 }: EmailComposerProps) {
@@ -106,14 +123,14 @@ export function EmailComposer({
     return prefix;
   };
 
-  const [to, setTo] = useState(getInitialTo());
+  const [to, setTo] = useState(initialData?.to ?? getInitialTo());
-  const [cc, setCc] = useState(getInitialCc());
+  const [cc, setCc] = useState(initialData?.cc ?? getInitialCc());
-  const [bcc, setBcc] = useState("");
+  const [bcc, setBcc] = useState(initialData?.bcc ?? "");
-  const [subject, setSubject] = useState(getInitialSubject());
+  const [subject, setSubject] = useState(initialData?.subject ?? getInitialSubject());
-  const [body, setBody] = useState(getInitialBody());
+  const [body, setBody] = useState(initialData?.body ?? getInitialBody());
-  const [showCc, setShowCc] = useState(!!getInitialCc());
+  const [showCc, setShowCc] = useState(initialData?.showCc ?? !!getInitialCc());
-  const [showBcc, setShowBcc] = useState(false);
+  const [showBcc, setShowBcc] = useState(initialData?.showBcc ?? false);
-  const [draftId, setDraftId] = useState<string | null>(null);
+  const [draftId, setDraftId] = useState<string | null>(initialData?.draftId ?? null);
   const [saveStatus, setSaveStatus] = useState<'idle' | 'saving' | 'saved' | 'error'>('idle');
   const saveTimeoutRef = useRef<NodeJS.Timeout | null>(null);
   const lastSavedDataRef = useRef<string>("");
@@ -121,11 +138,11 @@ export function EmailComposer({
   const fileInputRef = useRef<HTMLInputElement>(null);
   const [validationErrors, setValidationErrors] = useState<{ to?: boolean; subject?: boolean; body?: boolean }>({});
   const [shakeField, setShakeField] = useState<string | null>(null);
-  const [selectedIdentityId, setSelectedIdentityId] = useState<string | null>(null);
+  const [selectedIdentityId, setSelectedIdentityId] = useState<string | null>(initialData?.selectedIdentityId ?? null);
-  const [subAddressTag, setSubAddressTag] = useState<string>('');
+  const [subAddressTag, setSubAddressTag] = useState<string>(initialData?.subAddressTag ?? '');
   const [showTemplatePicker, setShowTemplatePicker] = useState(false);
   const [showSaveAsTemplate, setShowSaveAsTemplate] = useState(false);
-  const { dialogProps: confirmDialogProps, confirm } = useConfirmDialog();
+  const [showCloseDialog, setShowCloseDialog] = useState(false);
 
   const saveTemplateModalRef = useFocusTrap({
     isActive: showSaveAsTemplate,
@@ -133,9 +150,56 @@ export function EmailComposer({
     restoreFocus: true,
   });
 
+  const closeDialogRef = useFocusTrap({
+    isActive: showCloseDialog,
+    onEscape: () => setShowCloseDialog(false),
+    restoreFocus: true,
+  });
+
   const { client, identities, primaryIdentity } = useAuthStore();
   const getAutocomplete = useContactStore((s) => s.getAutocomplete);
   const addTemplate = useTemplateStore((s) => s.addTemplate);
+
+  // Keep a ref to current state for the unmount save
+  const stateRef = useRef({ to, cc, bcc, subject, body, showCc, showBcc, selectedIdentityId, subAddressTag, draftId });
+  stateRef.current = { to, cc, bcc, subject, body, showCc, showBcc, selectedIdentityId, subAddressTag, draftId };
+
+  // Track initial values for dirty detection (captured once on first render)
+  const initialValuesRef = useRef({ to, cc, bcc, subject, body, attachmentCount: 0 });
+  const isDirtyRef = useRef(false);
+  isDirtyRef.current = to !== initialValuesRef.current.to || cc !== initialValuesRef.current.cc ||
+    bcc !== initialValuesRef.current.bcc || subject !== initialValuesRef.current.subject ||
+    body !== initialValuesRef.current.body || attachments.length > initialValuesRef.current.attachmentCount;
+
+  // Ref to latest saveDraft for use in event handlers with stale closures
+  const saveDraftRef = useRef<() => Promise<string | null>>(() => Promise.resolve(null));
+
+  // Auto-save state on unmount (when user navigates away without explicitly closing)
+  useEffect(() => {
+    return () => {
+      if (onSaveState && isDirtyRef.current) {
+        const s = stateRef.current;
+        onSaveState({
+          ...s,
+          mode,
+          replyTo,
+        });
+      }
+    };
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  // Auto-save draft to server on page close (best-effort)
+  useEffect(() => {
+    const handleBeforeUnload = () => {
+      if (isDirtyRef.current) {
+        saveDraftRef.current();
+      }
+    };
+    window.addEventListener('beforeunload', handleBeforeUnload);
+    return () => window.removeEventListener('beforeunload', handleBeforeUnload);
+  }, []);
+
   const [autocompleteResults, setAutocompleteResults] = useState<Array<{ name: string; email: string }>>([]);
   const [activeAutoField, setActiveAutoField] = useState<'to' | 'cc' | 'bcc' | null>(null);
   const [autoSelectedIndex, setAutoSelectedIndex] = useState(-1);
@@ -389,15 +453,18 @@ export function EmailComposer({
     }
   };
 
-  // Trigger auto-save when content changes
+  // Keep saveDraftRef pointing to latest saveDraft
+  saveDraftRef.current = saveDraft;
+
+  // Trigger auto-save when content changes (only if user modified something)
   useEffect(() => {
     // Clear existing timeout
     if (saveTimeoutRef.current) {
       clearTimeout(saveTimeoutRef.current);
     }
 
-    // Don't auto-save if there's no content
+    // Don't auto-save if nothing has changed from initial state
-    if (!to && !subject && !body) {
+    if (!isDirtyRef.current) {
       return;
     }
 
@@ -498,77 +565,107 @@ export function EmailComposer({
       setDraftId(null);
       setSubAddressTag("");
       setValidationErrors({});
+      // Clear ref so unmount effect doesn't re-save
+      stateRef.current = { to: '', cc: '', bcc: '', subject: '', body: '', showCc: false, showBcc: false, selectedIdentityId: null, subAddressTag: '', draftId: null };
     } catch (err) {
       debug.error('Failed to send email:', err);
       toast.error(t('send_failed'));
     }
   };
 
-  const handleClose = async () => {
+  const cleanClose = () => {
-    if (draftId && (to || subject || body)) {
+    if (saveTimeoutRef.current) {
-      const confirmed = await confirm({
+      clearTimeout(saveTimeoutRef.current);
-        title: t('discard_draft_title'),
+    }
-        message: t('discard_draft_confirm'),
+    stateRef.current = { to: '', cc: '', bcc: '', subject: '', body: '', showCc: false, showBcc: false, selectedIdentityId: null, subAddressTag: '', draftId: null };
-        confirmText: t('discard'),
+    onClose?.();
-        variant: "destructive",
+  };
-      });
 
-      if (confirmed) {
+  const handleSaveDraftAndClose = async () => {
-        if (saveTimeoutRef.current) {
+    setShowCloseDialog(false);
-          clearTimeout(saveTimeoutRef.current);
+    if (saveTimeoutRef.current) {
-        }
+      clearTimeout(saveTimeoutRef.current);
+    }
+    await saveDraft();
+    stateRef.current = { to: '', cc: '', bcc: '', subject: '', body: '', showCc: false, showBcc: false, selectedIdentityId: null, subAddressTag: '', draftId: null };
+    onClose?.();
+  };
 
-        if (onDiscardDraft) {
+  const handleDiscardAndClose = () => {
-          onDiscardDraft(draftId);
+    setShowCloseDialog(false);
-        }
+    if (saveTimeoutRef.current) {
+      clearTimeout(saveTimeoutRef.current);
+    }
+    if (draftId && onDiscardDraft) {
+      onDiscardDraft(draftId);
+    }
+    stateRef.current = { to: '', cc: '', bcc: '', subject: '', body: '', showCc: false, showBcc: false, selectedIdentityId: null, subAddressTag: '', draftId: null };
+    onClose?.();
+  };
 
-        onClose?.();
+  const handleClose = () => {
-      }
+    if (isDirtyRef.current) {
+      setShowCloseDialog(true);
     } else {
-      onClose?.();
+      cleanClose();
     }
   };
 
   return (
-    <div className={cn("flex flex-col h-full bg-background border rounded-lg", className)}>
+    <div className={cn("flex flex-col h-full bg-background", className)}>
-      <div className="flex items-center justify-between px-4 py-3 border-b">
+      {/* Header - mobile: clean bar with close/send, desktop: title bar */}
-        <div className="flex items-center gap-2">
+      <div className="flex items-center justify-between px-4 py-3 border-b bg-background">
-          <h3 className="font-semibold">{t('new_message')}</h3>
+        <div className="flex items-center gap-3">
-          {saveStatus === 'saving' && (
+          <Button variant="ghost" size="icon" onClick={handleClose} className="h-9 w-9 md:h-8 md:w-8">
-            <div className="flex items-center gap-1 text-xs text-muted-foreground">
+            <X className="w-5 h-5 md:w-4 md:h-4" />
-              <Save className="w-3 h-3 animate-pulse" />
+          </Button>
-              <span>{t('saving')}</span>
+          <div className="flex items-center gap-2">
-            </div>
+            <h3 className="font-semibold text-base">{t('new_message')}</h3>
-          )}
+            {saveStatus === 'saving' && (
-          {saveStatus === 'saved' && (
+              <div className="flex items-center gap-1 text-xs text-muted-foreground">
-            <div className="flex items-center gap-1 text-xs text-green-600">
+                <Save className="w-3 h-3 animate-pulse" />
-              <Check className="w-3 h-3" />
+                <span className="hidden md:inline">{t('saving')}</span>
-              <span>{t('draft_saved')}</span>
+              </div>
-            </div>
+            )}
-          )}
+            {saveStatus === 'saved' && (
-          {saveStatus === 'error' && (
+              <div className="flex items-center gap-1 text-xs text-green-600">
-            <div className="flex items-center gap-1 text-xs text-red-600">
+                <Check className="w-3 h-3" />
-              <X className="w-3 h-3" />
+                <span className="hidden md:inline">{t('draft_saved')}</span>
-              <span>{t('save_failed')}</span>
+              </div>
-            </div>
+            )}
-          )}
+            {saveStatus === 'error' && (
+              <div className="flex items-center gap-1 text-xs text-red-600">
+                <X className="w-3 h-3" />
+                <span className="hidden md:inline">{t('save_failed')}</span>
+              </div>
+            )}
+          </div>
         </div>
-        <Button variant="ghost" size="icon" onClick={handleClose}>
+        {/* Mobile: send button in header */}
-          <X className="w-4 h-4" />
+        <Button
+          onClick={handleSend}
+          disabled={!canSend}
+          title={getSendTooltip()}
+          size="sm"
+          className="md:hidden h-9 px-4"
+        >
+          <Send className="w-4 h-4 mr-1.5" />
+          {t('send')}
         </Button>
       </div>
 
-      <div className="flex-1 flex flex-col">
+      <div className="flex-1 flex flex-col min-h-0">
-        <div className="space-y-2 px-4 py-3 border-b">
+        {/* Fields section */}
-          {/* From field - show dropdown if multiple identities, otherwise display email */}
+        <div className="space-y-0 border-b">
-          <div className="flex items-center gap-2">
+          {/* From field */}
-            <span className="text-sm text-muted-foreground w-16">{t('from')}:</span>
+          <div className="flex items-center gap-2 px-4 py-2.5 border-b border-border/50">
-            <div className="flex-1 flex items-center gap-1">
+            <span className="text-sm text-muted-foreground w-12 md:w-16 shrink-0">{t('from')}:</span>
+            <div className="flex-1 flex items-center gap-1 min-w-0">
               {identities.length > 1 ? (
                 <select
                   value={selectedIdentityId || primaryIdentity?.id || ''}
                   onChange={(e) => setSelectedIdentityId(e.target.value)}
-                  className="flex-1 bg-transparent text-sm text-foreground outline-none cursor-pointer hover:text-muted-foreground transition-colors"
+                  className="flex-1 bg-transparent text-sm text-foreground outline-none cursor-pointer hover:text-muted-foreground transition-colors min-w-0 truncate"
                 >
                   {identities.map((identity) => (
                     <option key={identity.id} value={identity.id}>
@@ -577,7 +674,7 @@ export function EmailComposer({
                   ))}
                 </select>
               ) : (
-                <span className="text-sm text-foreground flex-1">
+                <span className="text-sm text-foreground flex-1 truncate">
                   {subAddressTag ? (
                     <span className="font-mono">
                       {generateSubAddress(primaryIdentity?.email || '', subAddressTag)}
@@ -615,9 +712,10 @@ export function EmailComposer({
             </div>
           </div>
 
-          <div className={cn("flex items-center gap-2 relative", shakeField === 'to' && "animate-shake")}>
+          {/* To field */}
-            <span className="text-sm text-muted-foreground w-16">{t('to')}:</span>
+          <div className={cn("flex items-center gap-2 px-4 py-2.5 border-b border-border/50 relative", shakeField === 'to' && "animate-shake")}>
-            <div className="flex-1 relative">
+            <span className="text-sm text-muted-foreground w-12 md:w-16 shrink-0">{t('to')}:</span>
+            <div className="flex-1 relative min-w-0">
               <Input
                 ref={toInputRef}
                 type="email"
@@ -631,7 +729,7 @@ export function EmailComposer({
                 onKeyDown={(e) => handleAutoKeyDown(e, 'to')}
                 onBlur={(e) => handleAutoBlur(e, 'to')}
                 className={cn(
-                  "border-0 focus-visible:ring-0",
+                  "border-0 focus-visible:ring-0 h-8 px-0 text-sm",
                   validationErrors.to && "ring-2 ring-red-500 dark:ring-red-400"
                 )}
                 role="combobox"
@@ -642,18 +740,18 @@ export function EmailComposer({
                 aria-invalid={validationErrors.to || undefined}
               />
               {validationErrors.to && (
-                <p className="text-xs text-red-600 dark:text-red-400 mt-0.5 px-1">{t('validation.recipient_required')}</p>
+                <p className="text-xs text-red-600 dark:text-red-400 mt-0.5">{t('validation.recipient_required')}</p>
               )}
               {activeAutoField === 'to' && autocompleteResults.length > 0 && (
                 <AutocompleteDropdown ref={toDropdownRef} id="autocomplete-to" results={autocompleteResults} selectedIndex={autoSelectedIndex} onSelect={(email) => insertAutocomplete(email, 'to')} />
               )}
             </div>
-            <div className="flex gap-1">
+            <div className="flex gap-0.5 shrink-0">
               <Button
                 variant="ghost"
                 size="sm"
                 onClick={() => setShowCc(!showCc)}
-                className="text-xs"
+                className="text-xs h-7 px-2"
               >
                 Cc
               </Button>
@@ -661,17 +759,18 @@ export function EmailComposer({
                 variant="ghost"
                 size="sm"
                 onClick={() => setShowBcc(!showBcc)}
-                className="text-xs"
+                className="text-xs h-7 px-2"
               >
                 Bcc
               </Button>
             </div>
           </div>
 
+          {/* Cc field */}
           {showCc && (
-            <div className="flex items-center gap-2 relative">
+            <div className="flex items-center gap-2 px-4 py-2.5 border-b border-border/50 relative">
-              <span className="text-sm text-muted-foreground w-16">{t('cc_label')}</span>
+              <span className="text-sm text-muted-foreground w-12 md:w-16 shrink-0">{t('cc_label')}</span>
-              <div className="flex-1 relative">
+              <div className="flex-1 relative min-w-0">
                 <Input
                   ref={ccInputRef}
                   type="email"
@@ -683,7 +782,7 @@ export function EmailComposer({
                   }}
                   onKeyDown={(e) => handleAutoKeyDown(e, 'cc')}
                   onBlur={(e) => handleAutoBlur(e, 'cc')}
-                  className="border-0 focus-visible:ring-0"
+                  className="border-0 focus-visible:ring-0 h-8 px-0 text-sm"
                   role="combobox"
                   aria-expanded={activeAutoField === 'cc' && autocompleteResults.length > 0}
                   aria-autocomplete="list"
@@ -697,10 +796,11 @@ export function EmailComposer({
             </div>
           )}
 
+          {/* Bcc field */}
           {showBcc && (
-            <div className="flex items-center gap-2 relative">
+            <div className="flex items-center gap-2 px-4 py-2.5 border-b border-border/50 relative">
-              <span className="text-sm text-muted-foreground w-16">{t('bcc_label')}</span>
+              <span className="text-sm text-muted-foreground w-12 md:w-16 shrink-0">{t('bcc_label')}</span>
-              <div className="flex-1 relative">
+              <div className="flex-1 relative min-w-0">
                 <Input
                   ref={bccInputRef}
                   type="email"
@@ -712,7 +812,7 @@ export function EmailComposer({
                   }}
                   onKeyDown={(e) => handleAutoKeyDown(e, 'bcc')}
                   onBlur={(e) => handleAutoBlur(e, 'bcc')}
-                  className="border-0 focus-visible:ring-0"
+                  className="border-0 focus-visible:ring-0 h-8 px-0 text-sm"
                   role="combobox"
                   aria-expanded={activeAutoField === 'bcc' && autocompleteResults.length > 0}
                   aria-autocomplete="list"
@@ -726,8 +826,9 @@ export function EmailComposer({
             </div>
           )}
 
-          <div className="flex items-center gap-2">
+          {/* Subject field */}
-            <span className="text-sm text-muted-foreground w-16">{t('subject_label')}</span>
+          <div className="flex items-center gap-2 px-4 py-2.5">
+            <span className="text-sm text-muted-foreground w-12 md:w-16 shrink-0">{t('subject_label')}</span>
             <Input
               type="text"
               placeholder={t('subject_placeholder')}
@@ -737,7 +838,7 @@ export function EmailComposer({
                 if (validationErrors.subject) setValidationErrors(prev => ({ ...prev, subject: false }));
               }}
               className={cn(
-                "flex-1 border-0 focus-visible:ring-0",
+                "flex-1 border-0 focus-visible:ring-0 h-8 px-0 text-sm",
                 validationErrors.subject && "ring-2 ring-red-500 dark:ring-red-400"
               )}
               aria-invalid={validationErrors.subject || undefined}
@@ -745,6 +846,7 @@ export function EmailComposer({
           </div>
         </div>
 
+        {/* Body */}
         <div className="flex-1 px-4 py-3 min-h-0">
           <textarea
             className={cn(
@@ -761,6 +863,7 @@ export function EmailComposer({
           />
         </div>
 
+        {/* Attachments */}
         {attachments.length > 0 && (
           <div className="px-4 py-2 border-t">
             <div className="flex flex-wrap gap-2">
@@ -786,7 +889,7 @@ export function EmailComposer({
                     ) : (
                       <Paperclip className="w-3 h-3 flex-shrink-0" />
                     )}
-                    <span className="max-w-[200px] truncate">{att.file.name}</span>
+                    <span className="max-w-[150px] md:max-w-[200px] truncate">{att.file.name}</span>
                     <span className="text-xs text-muted-foreground whitespace-nowrap">
                       ({formatFileSize(att.file.size)})
                     </span>
@@ -804,35 +907,10 @@ export function EmailComposer({
           </div>
         )}
 
-        <div className="flex items-center justify-between px-4 py-3 border-t">
+        {/* Bottom toolbar */}
-          {/* Left side - Discard button */}
+        <div className="flex items-center justify-between px-4 py-2.5 border-t bg-background">
-          <button
+          {/* Left side actions */}
-            type="button"
+          <div className="flex items-center gap-1">
-            onClick={handleClose}
-            className="text-sm text-muted-foreground hover:text-red-500 transition-colors"
-          >
-            {t('discard')}
-          </button>
-
-          {/* Right side - Template, Save as Template, Attach and Send */}
-          <div className="flex items-center gap-2">
-            <Button
-              variant="ghost"
-              size="sm"
-              onClick={() => setShowTemplatePicker(true)}
-              title={t('use_template')}
-            >
-              <FileText className="w-4 h-4 mr-2" />
-              {t('use_template')}
-            </Button>
-            <Button
-              variant="ghost"
-              size="sm"
-              onClick={() => setShowSaveAsTemplate(true)}
-              title={t('save_as_template')}
-            >
-              <BookmarkPlus className="w-4 h-4" />
-            </Button>
             <input
               ref={fileInputRef}
               type="file"
@@ -843,16 +921,47 @@ export function EmailComposer({
             />
             <Button
               variant="ghost"
-              size="sm"
+              size="icon"
               onClick={() => fileInputRef.current?.click()}
+              className="h-9 w-9"
+              title={t('attach')}
             >
-              <Paperclip className="w-4 h-4 mr-2" />
+              <Paperclip className="w-4 h-4" />
-              {t('attach')}
             </Button>
+            <Button
+              variant="ghost"
+              size="icon"
+              onClick={() => setShowTemplatePicker(true)}
+              title={t('use_template')}
+              className="h-9 w-9"
+            >
+              <FileText className="w-4 h-4" />
+            </Button>
+            <Button
+              variant="ghost"
+              size="icon"
+              onClick={() => setShowSaveAsTemplate(true)}
+              title={t('save_as_template')}
+              className="h-9 w-9"
+            >
+              <BookmarkPlus className="w-4 h-4" />
+            </Button>
+          </div>
+
+          {/* Right side - Discard + Send (desktop) */}
+          <div className="flex items-center gap-2">
+            <button
+              type="button"
+              onClick={handleClose}
+              className="text-sm text-muted-foreground hover:text-red-500 transition-colors px-2 py-1"
+            >
+              {t('discard')}
+            </button>
             <Button
               onClick={handleSend}
               disabled={!canSend}
               title={getSendTooltip()}
+              className="hidden md:inline-flex"
             >
               <Send className="w-4 h-4 mr-2" />
               {t('send')}
@@ -896,7 +1005,37 @@ export function EmailComposer({
         </div>
       )}
 
-      <ConfirmDialog {...confirmDialogProps} />
+      {showCloseDialog && (
+        <div
+          className="fixed inset-0 bg-black/50 backdrop-blur-[1px] flex items-center justify-center z-[60] p-4 animate-in fade-in duration-150"
+          onClick={() => setShowCloseDialog(false)}
+        >
+          <div
+            ref={closeDialogRef}
+            role="alertdialog"
+            aria-modal="true"
+            onClick={(e) => e.stopPropagation()}
+            className="bg-background border border-border rounded-lg shadow-xl w-full max-w-md animate-in zoom-in-95 duration-200"
+          >
+            <div className="p-6">
+              <h2 className="text-lg font-semibold text-foreground">{t('close_draft_title')}</h2>
+              <p className="mt-2 text-sm text-muted-foreground">{t('close_draft_message')}</p>
+            </div>
+            <div className="flex items-center justify-end gap-3 px-6 pb-6">
+              <Button variant="outline" onClick={() => setShowCloseDialog(false)}>
+                {t('cancel')}
+              </Button>
+              <Button variant="destructive" onClick={handleDiscardAndClose}>
+                {t('discard')}
+              </Button>
+              <Button onClick={handleSaveDraftAndClose}>
+                <Save className="w-4 h-4 mr-2" />
+                {t('save_draft')}
+              </Button>
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   );
 }

locales/en/common.json

@@ -331,7 +331,11 @@
     "upload_progress": "Uploading {uploaded} / {total}",
     "upload_cancel": "Cancel upload",
     "upload_failed": "Failed to upload {filename}",
-    "send_failed": "Failed to send email"
+    "send_failed": "Failed to send email",
+    "continue_draft": "Continue draft",
+    "close_draft_title": "Save or discard draft?",
+    "close_draft_message": "You have unsaved changes. Would you like to save this as a draft or discard it?",
+    "save_draft": "Save Draft"
   },
   "confirm_dialog": {
     "confirm": "Confirm",