diff --git a/app/[locale]/calendar/page.tsx b/app/[locale]/calendar/page.tsx
index cbc40693..eb39244d 100644
--- a/app/[locale]/calendar/page.tsx
+++ b/app/[locale]/calendar/page.tsx
@@ -32,6 +32,7 @@ import { CalendarSidebarPanel } from "@/components/calendar/calendar-sidebar-pan
 import { EventModal, type PendingEventPreview } from "@/components/calendar/event-modal";
 import { EventDetailPopover } from "@/components/calendar/event-detail-popover";
 import { EventContextMenu } from "@/components/calendar/event-context-menu";
+import { AppTopBannerSlot } from "@/components/plugins/app-top-banner-slot";
 import { EmptySpaceContextMenu } from "@/components/calendar/empty-space-context-menu";
 import { useContextMenu } from "@/hooks/use-context-menu";
 import { useRefreshGesture } from "@/hooks/use-refresh-gesture";
@@ -1216,7 +1217,9 @@ export default function CalendarPage() {
   };
 
   return (
-    <div className={cn("flex h-dvh bg-background overflow-hidden pt-[env(safe-area-inset-top)]", isMobile && "flex-col")}>
+    <div className="flex flex-col h-dvh bg-background overflow-hidden pt-[env(safe-area-inset-top)]">
+      <AppTopBannerSlot />
+      <div className={cn("flex flex-1 min-h-0 overflow-hidden", isMobile && "flex-col")}>
       {/* Left Navigation Rail */}
       {!isMobile && (
         <div className="w-14 bg-secondary flex flex-col flex-shrink-0" style={{ borderRight: '1px solid rgba(128, 128, 128, 0.3)' }}>
@@ -1580,6 +1583,7 @@ export default function CalendarPage() {
           />
         );
       })()}
+      </div>
     </div>
   );
 }
diff --git a/app/[locale]/contacts/page.tsx b/app/[locale]/contacts/page.tsx
index 552424c2..3fc1f59f 100644
--- a/app/[locale]/contacts/page.tsx
+++ b/app/[locale]/contacts/page.tsx
@@ -15,6 +15,7 @@ import { ContactsSidebar, type ContactCategory } from "@/components/contacts/con
 import { ContactImportDialog } from "@/components/contacts/contact-import-dialog";
 import { RenameDialog } from "@/components/files/rename-dialog";
 import { exportContacts } from "@/components/contacts/contact-export";
+import { AppTopBannerSlot } from "@/components/plugins/app-top-banner-slot";
 import { useContactStore, getContactDisplayName } from "@/stores/contact-store";
 import { useAuthStore, redirectToLogin } from "@/stores/auth-store";
 import { useEmailStore } from "@/stores/email-store";
@@ -649,7 +650,9 @@ export default function ContactsPage() {
   };
 
   return (
-    <div className={cn("flex h-dvh bg-background overflow-hidden pt-[env(safe-area-inset-top)]", isMobile && "flex-col")}>
+    <div className="flex flex-col h-dvh bg-background overflow-hidden pt-[env(safe-area-inset-top)]">
+      <AppTopBannerSlot />
+      <div className={cn("flex flex-1 min-h-0 overflow-hidden", isMobile && "flex-col")}>
       {/* Navigation Rail - desktop only */}
       {!isMobile && (
         <div className="w-14 bg-secondary flex flex-col flex-shrink-0" style={{ borderRight: '1px solid rgba(128, 128, 128, 0.3)' }}>
@@ -882,6 +885,7 @@ export default function ContactsPage() {
           />
         );
       })()}
+      </div>
     </div>
   );
 }
diff --git a/app/[locale]/files/page.tsx b/app/[locale]/files/page.tsx
index df7bcdd2..7a96b984 100644
--- a/app/[locale]/files/page.tsx
+++ b/app/[locale]/files/page.tsx
@@ -24,6 +24,7 @@ import { ImagePreviewModal } from "@/components/files/image-preview-modal";
 import { FilePreviewModal } from "@/components/files/file-preview-modal";
 import { loadFilesSettings } from "@/components/files/files-settings-dialog";
 import type { FolderLayout } from "@/components/files/files-settings-dialog";
+import { AppTopBannerSlot } from "@/components/plugins/app-top-banner-slot";
 import { AlertTriangle } from "lucide-react";
 
 export default function FilesPage() {
@@ -374,7 +375,9 @@ export default function FilesPage() {
   if (!isAuthenticated) return null;
 
   return (
-    <div className="flex h-dvh bg-background overflow-hidden pt-[env(safe-area-inset-top)]">
+    <div className="flex flex-col h-dvh bg-background overflow-hidden pt-[env(safe-area-inset-top)]">
+      <AppTopBannerSlot />
+      <div className="flex flex-1 min-h-0 overflow-hidden">
       {!isMobile && (
         <div className="w-14 bg-secondary flex flex-col flex-shrink-0" style={{ borderRight: '1px solid rgba(128, 128, 128, 0.3)' }}>
           <NavigationRail
@@ -514,6 +517,7 @@ export default function FilesPage() {
 
       <SidebarAppsModal isOpen={showAppsModal} onClose={closeAppsModal} />
       <ConfirmDialog {...confirmDialogProps} />
+      </div>
     </div>
   );
 }
diff --git a/app/[locale]/page.tsx b/app/[locale]/page.tsx
index 229a4600..e1256d3d 100644
--- a/app/[locale]/page.tsx
+++ b/app/[locale]/page.tsx
@@ -60,7 +60,7 @@ import { ResizeHandle } from "@/components/layout/resize-handle";
 import { Button } from "@/components/ui/button";
 import { useConfig } from "@/hooks/use-config";
 import { usePluginStore } from "@/stores/plugin-store";
-import { PluginSlot } from "@/components/plugins/plugin-slot";
+import { AppTopBannerSlot } from "@/components/plugins/app-top-banner-slot";
 import { useThemeStore } from "@/stores/theme-store";
 import { consumePendingMailto, subscribeToPendingMailto } from "@/lib/protocol-handlers/session";
 import type { ParsedMailto } from "@/lib/protocol-handlers/mailto";
@@ -98,7 +98,7 @@ export default function Home() {
   const [pendingMailtoAccountChoice, setPendingMailtoAccountChoice] = useState<ParsedMailto | null>(null);
   const [isProtocolAccountSwitching, setIsProtocolAccountSwitching] = useState(false);
   const markAsReadTimeoutRef = useRef<NodeJS.Timeout | null>(null);
-  const { isAuthenticated, client, logout, checkAuth, switchAccount, activeAccountId, isLoading: authLoading, connectionLost, isRateLimited, rateLimitUntil, username, serverUrl } = useAuthStore();
+  const { isAuthenticated, client, logout, checkAuth, switchAccount, activeAccountId, isLoading: authLoading, connectionLost, isRateLimited, rateLimitUntil } = useAuthStore();
   const { identities } = useIdentityStore();
   useIdentitySync();
   const trustedSendersAddressBook = useSettingsStore((state) => state.trustedSendersAddressBook);
@@ -1961,7 +1961,7 @@ export default function Home() {
   return (
     <DragDropProvider>
       <div className="flex flex-col h-dvh bg-background overflow-hidden pt-[env(safe-area-inset-top)]">
-        <PluginSlot name="app-top-banner" extraProps={{ username, serverUrl }} />
+        <AppTopBannerSlot />
         {isRateLimited && rateLimitSecondsLeft !== null && (
           <div className="flex items-center justify-center gap-2 bg-amber-500/10 border-b border-amber-500/30 text-amber-700 dark:text-amber-300 text-sm py-1.5 px-4 flex-shrink-0">
             <AlertTriangle className="h-3.5 w-3.5" />
diff --git a/app/[locale]/settings/page.tsx b/app/[locale]/settings/page.tsx
index 14dbe9c1..d349d383 100644
--- a/app/[locale]/settings/page.tsx
+++ b/app/[locale]/settings/page.tsx
@@ -39,6 +39,7 @@ import {
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { AppearanceSettings } from '@/components/settings/appearance-settings';
+import { AppTopBannerSlot } from '@/components/plugins/app-top-banner-slot';
 import { LayoutSettings } from '@/components/settings/layout-settings';
 import { LanguageSettings } from '@/components/settings/language-settings';
 import { ReadingSettings } from '@/components/settings/reading-settings';
@@ -687,6 +688,7 @@ export default function SettingsPage() {
     if (mobileShowContent) {
       return (
         <div className="flex flex-col h-dvh bg-background pt-[env(safe-area-inset-top)]">
+          <AppTopBannerSlot />
           <div className="flex items-center gap-2 px-4 h-14 border-b border-border bg-background shrink-0">
             <Button
               variant="ghost"
@@ -717,6 +719,7 @@ export default function SettingsPage() {
 
     return (
       <div className="flex flex-col h-dvh bg-background pt-[env(safe-area-inset-top)]">
+        <AppTopBannerSlot />
         <div className="flex items-center gap-2 px-4 h-14 border-b border-border bg-background shrink-0">
           <Button
             variant="ghost"
@@ -826,7 +829,9 @@ export default function SettingsPage() {
 
   // Desktop layout
   return (
-    <div className="flex h-dvh bg-background pt-[env(safe-area-inset-top)]">
+    <div className="flex flex-col h-dvh bg-background pt-[env(safe-area-inset-top)]">
+      <AppTopBannerSlot />
+      <div className="flex flex-1 min-h-0">
       <div className="w-14 bg-secondary flex flex-col flex-shrink-0" style={{ borderRight: '1px solid rgba(128, 128, 128, 0.3)' }}>
         <NavigationRail
           collapsed
@@ -958,6 +963,7 @@ export default function SettingsPage() {
       </>
       )}
       <SidebarAppsModal isOpen={showAppsModal} onClose={closeAppsModal} />
+      </div>
     </div>
   );
 }
diff --git a/components/plugins/app-top-banner-slot.tsx b/components/plugins/app-top-banner-slot.tsx
new file mode 100644
index 00000000..96b633a0
--- /dev/null
+++ b/components/plugins/app-top-banner-slot.tsx
@@ -0,0 +1,16 @@
+'use client';
+
+import { PluginSlot } from '@/components/plugins/plugin-slot';
+import { useAuthStore } from '@/stores/auth-store';
+
+/**
+ * Mounts the `app-top-banner` plugin slot with the current session
+ * username + serverUrl as extraProps. Drop this at the top of every
+ * authenticated page so plugins like impersonation-notice render
+ * everywhere, not just on the mail page.
+ */
+export function AppTopBannerSlot() {
+  const username = useAuthStore((s) => s.username);
+  const serverUrl = useAuthStore((s) => s.serverUrl);
+  return <PluginSlot name="app-top-banner" extraProps={{ username, serverUrl }} />;
+}