feat(ui): add desktop footer, legal custom link and about dialog

frontend/src/App.tsx

@@ -65,6 +65,8 @@ import { useMobileActions } from './context/MobileActionContext';
 import { MobileHeaderMenu } from './components/MobileHeaderMenu';
 import { UserAvatar } from './components/UserAvatar';
 import { CommandPalette } from './components/CommandPalette';
+import { AppFooter } from './components/AppFooter';
+import { AboutModal } from './components/AboutModal';
 import { APP_VERSION } from './version';
 
 type ActiveTab =
@@ -170,6 +172,7 @@ export const App: React.FC = () => {
 
   // Profile Dropdown State
   const [showProfileMenu, setShowProfileMenu] = useState(false);
+  const [showAbout, setShowAbout] = useState(false);
   const dropdownRef = useRef<HTMLDivElement | null>(null);
 
   // Mobile Navigation & Quick-Action State
@@ -1119,8 +1122,8 @@ export const App: React.FC = () => {
       {/* Main Container */}
       {/* The workspace fills the window exactly and scrolls only inside the note, never the page */}
       <main
-        className={`flex-1 max-w-6xl w-full mx-auto px-3 sm:px-4 pt-3 pb-24 sm:pb-6 ${
-          activeTab === 'workspace' ? 'min-h-0 flex flex-col' : ''
+        className={`flex-1 max-w-6xl w-full mx-auto px-3 sm:px-4 pt-3 pb-24 ${
+          activeTab === 'workspace' ? 'min-h-0 flex flex-col sm:pb-0' : 'sm:pb-6'
         }`}
       >
         <ViewErrorBoundary onReset={() => setActiveTab('triage')}>
@@ -1202,6 +1205,11 @@ export const App: React.FC = () => {
         </ViewErrorBoundary>
       </main>
 
+      <AppFooter
+        legal={authStatus.legal}
+        onOpenAbout={() => setShowAbout(true)}
+      />
+
       {/* MOBILE BOTTOM NAVIGATION BAR (5 equal columns -> + FAB is dead-center) */}
       <nav className="sm:hidden fixed bottom-0 left-0 right-0 z-40 bg-panel/95 backdrop-blur-md border-t border-border px-2 pt-1.5 pb-[calc(0.5rem+env(safe-area-inset-bottom))] grid grid-cols-5 items-center shadow-panel">
         {/* Col 1: Triage */}
@@ -1594,6 +1602,19 @@ export const App: React.FC = () => {
                 <span>Hilfe & Anleitung</span>
               </button>
 
+              <button
+                type="button"
+                onClick={() => {
+                  triggerHaptic(10);
+                  setShowMobileProfile(false);
+                  setShowAbout(true);
+                }}
+                className="w-full px-3 py-2.5 rounded-btn text-left flex items-center gap-3 hover:bg-panel-elevated transition-colors text-xs cursor-pointer text-main"
+              >
+                <Brain className="w-4 h-4 text-accent" />
+                <span>Über MindSift</span>
+              </button>
+
               {isServerAdmin && (
                 <button
                   type="button"
@@ -1626,6 +1647,11 @@ export const App: React.FC = () => {
                 <span>Abmelden</span>
               </button>
             </div>
+
+            {/* Version & About Hint on Mobile */}
+            <div className="pt-2 text-center text-[10px] text-faint font-mono">
+              MindSift {APP_VERSION}
+            </div>
           </div>
         </div>
       )}
@@ -1725,6 +1751,8 @@ export const App: React.FC = () => {
         onOpenTask={handleOpenTask}
         onOpenList={handleOpenList}
       />
+
+      {showAbout && <AboutModal onClose={() => setShowAbout(false)} />}
     </div>
   );
 };