fix: Remove top padding gap and add exit/logout to More page

Fixed 2 issues:

1. Top Padding Gap (pt-16 → removed)
   Problem: Mobile fullscreen had pt-16 padding creating gap at top
   Cause: Redundant padding when header is hidden in fullscreen
   Solution: Removed pt-16 from mobile fullscreen layout

   Before:
   <div className="flex flex-1 flex-col min-h-0 pt-16">

   After:
   <div className="flex flex-1 flex-col min-h-0">

   Result: No gap, submenu starts at top-0 ✓

2. Exit/Logout Buttons in More Page
   Problem: No way to exit fullscreen or logout from mobile
   Solution: Added context-aware button to More page

   WP-Admin Mode:
   - Shows "Exit Fullscreen" button
   - Exits fullscreen mode (back to normal WP-admin)

   Standalone Mode (PWA):
   - Shows "Logout" button
   - Redirects to WP-admin login

   Implementation:
   - Created AppContext to provide isStandalone and exitFullscreen
   - Wrapped Shell with AppProvider
   - More page uses useApp() to get context
   - Conditional rendering based on mode

Files Modified:
- App.tsx: Removed pt-16, added AppProvider
- AppContext.tsx: New context for app-level state
- More/index.tsx: Added Exit/Logout button

Result:
✅ No top gap in mobile fullscreen
✅ Exit fullscreen available in WP-admin mode
✅ Logout available in standalone mode
✅ Clean, functional mobile UX! 🎯

admin-spa/src/routes/More/index.tsx

@@ -1,8 +1,10 @@
 import React, { useEffect } from 'react';
 import { useNavigate, Link } from 'react-router-dom';
-import { Tag, Settings as SettingsIcon, ChevronRight } from 'lucide-react';
+import { Tag, Settings as SettingsIcon, ChevronRight, Minimize2, LogOut } from 'lucide-react';
 import { __ } from '@/lib/i18n';
 import { usePageHeader } from '@/contexts/PageHeaderContext';
+import { useApp } from '@/contexts/AppContext';
+import { Button } from '@/components/ui/button';
 
 interface MenuItem {
   icon: React.ReactNode;
@@ -29,12 +31,18 @@ const menuItems: MenuItem[] = [
 export default function MorePage() {
   const navigate = useNavigate();
   const { setPageHeader, clearPageHeader } = usePageHeader();
+  const { isStandalone, exitFullscreen } = useApp();
   
   useEffect(() => {
     setPageHeader(__('More'));
     return () => clearPageHeader();
   }, [setPageHeader, clearPageHeader]);
 
+  const handleLogout = () => {
+    // Clear auth and redirect to login
+    window.location.href = window.WNW_CONFIG?.wpAdminUrl || '/wp-admin';
+  };
+
   return (
     <div className="min-h-screen bg-background pb-20">
       {/* Remove inline header - use PageHeader component instead */}
@@ -65,6 +73,29 @@ export default function MorePage() {
           </button>
         ))}
       </div>
+
+      {/* Exit Fullscreen / Logout */}
+      <div className="px-4 py-6">
+        {isStandalone ? (
+          <Button
+            onClick={handleLogout}
+            variant="outline"
+            className="w-full justify-start gap-3"
+          >
+            <LogOut className="w-5 h-5" />
+            {__('Logout')}
+          </Button>
+        ) : (
+          <Button
+            onClick={exitFullscreen}
+            variant="outline"
+            className="w-full justify-start gap-3"
+          >
+            <Minimize2 className="w-5 h-5" />
+            {__('Exit Fullscreen')}
+          </Button>
+        )}
+      </div>
     </div>
   );
 }