Add swipe-to-open sidebar on all pages + fix bottom bar styling

- Create SwipeableContent component for sidebar swipe on non-tab pages
- Add swipe-to-close sidebar from overlay
- Make swipe work from entire page (ignoring interactive elements)
- Show title and divider on desktop when tab bar is at bottom
- Hide title/divider only on mobile for bottom position

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/pages/Feature2.tsx

@@ -1,6 +1,7 @@
 import { useTranslation } from '../contexts/LanguageContext';
 import { useSidebar } from '../contexts/SidebarContext';
 import TabsScroller from '../components/TabsScroller';
+import { SwipeableContent } from '../components/SwipeableContent';
 import '../styles/AdminPanel.css';
 
 export default function Feature2() {
@@ -8,7 +9,7 @@ export default function Feature2() {
   const { toggleMobileMenu } = useSidebar();
 
   return (
-    <main className="main-content">
+    <SwipeableContent className="main-content">
       <div className="page-tabs-container">
         <TabsScroller className="page-tabs-slider">
           <button className="mobile-menu-btn" onClick={toggleMobileMenu} aria-label={t.theme.toggleMenu}>
@@ -30,6 +31,6 @@ export default function Feature2() {
           <p>{t.features.comingSoon}</p>
         </div>
       </div>
-    </main>
+    </SwipeableContent>
   );
 }