feat: enhance compose functionality with button integration and translations

components/email/email-viewer.tsx

@@ -68,6 +68,7 @@ import {
   HelpCircle,
   EditIcon,
   PlayCircle,
+  PenSquare,
 } from "lucide-react";
 import { useTranslations } from "next-intl";
 import type { Attachment as PostalMimeAttachment } from 'postal-mime';
@@ -121,6 +122,7 @@ interface EmailViewerProps {
   onNavigatePrev?: () => void;
   onShowShortcuts?: () => void;
   onEditDraft?: () => void;
+  onCompose?: () => void;
   currentUserEmail?: string;
   currentUserName?: string;
   currentMailboxRole?: string;
@@ -865,6 +867,7 @@ export function EmailViewer({
   onNavigatePrev,
   onShowShortcuts,
   onEditDraft,
+  onCompose,
   currentUserEmail,
   currentUserName,
   currentMailboxRole,
@@ -2836,6 +2839,12 @@ export function EmailViewer({
           </div>
           <h3 className="text-xl font-semibold text-foreground mb-2">{t('no_conversation_selected')}</h3>
           <p className="text-muted-foreground">{t('no_conversation_description')}</p>
+          {onCompose && (
+            <Button onClick={onCompose} className="mt-6" title={t('compose_hint')}>
+              <PenSquare className="w-4 h-4 mr-2" />
+              {t('compose')}
+            </Button>
+          )}
         </div>
       </div>
     );

components/layout/sidebar.tsx

@@ -12,7 +12,6 @@ import {
   Star,
   Trash2,
   Archive,
-  PenSquare,
   ChevronsLeft,
   ChevronsRight,
   ChevronRight,
@@ -762,19 +761,7 @@ export function Sidebar({
         {!isCollapsed && <PluginSlot name="sidebar-widget" className="border-t border-border" />}
       </div>
 
-      {/* Compose Button */}
-      <div className={cn("border-t border-border", isCollapsed ? "flex justify-center py-3" : "px-3 py-3")}>
-        {isCollapsed ? (
-          <Button onClick={onCompose} variant="ghost" size="icon" title={t("compose_hint")} data-tour="compose-button">
-            <PenSquare className="w-5 h-5" />
-          </Button>
-        ) : (
-          <Button onClick={onCompose} className="w-full" title={t("compose_hint")} data-tour="compose-button">
-            <PenSquare className="w-4 h-4 mr-2" />
-            {t("compose")}
-          </Button>
-        )}
-      </div>
+
     </div>
   );
 }