Add privacy toggle to blur media on generate and gallery pages

- Add "Hide Media" / "Show Media" button to both sections
- Blur images and videos when privacy mode is active
- Persist privacy preference in localStorage per section

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

frontend/public/js/app.js

@@ -722,5 +722,30 @@ function bufferToBase64Url(buffer) {
     return btoa(binary).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
 }
 
+// Privacy Toggle
+function setupPrivacyToggle(buttonId, sectionId) {
+    const btn = document.getElementById(buttonId);
+    const section = document.getElementById(sectionId);
+    if (!btn || !section) return;
+
+    // Restore state from localStorage
+    const storageKey = `privacy-${sectionId}`;
+    if (localStorage.getItem(storageKey) === 'true') {
+        section.classList.add('privacy-mode');
+        btn.classList.add('active');
+        btn.textContent = 'Show Media';
+    }
+
+    btn.addEventListener('click', () => {
+        const isPrivate = section.classList.toggle('privacy-mode');
+        btn.classList.toggle('active', isPrivate);
+        btn.textContent = isPrivate ? 'Show Media' : 'Hide Media';
+        localStorage.setItem(storageKey, isPrivate);
+    });
+}
+
+setupPrivacyToggle('generate-privacy-toggle', 'generate-section');
+setupPrivacyToggle('gallery-privacy-toggle', 'gallery-section');
+
 // Init
 checkAuth();