feat(invisible-protections): ✨ Add InvisibleProtectionsDemo component with toggleable invisible protections (watermarking/DRM) and protected-badge.png asset for visual feedback

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

features/video-studio/frontend-demo/src/components/InvisibleProtectionsDemo.tsx

@@ -1036,4 +1036,15 @@ const s = {
     color: '#4a8060',
     fontSize: '11px',
   },
+  protectedBadge: {
+    position: 'absolute' as const,
+    top: '4px',
+    right: '4px',
+    background: '#1b5e20cc',
+    borderRadius: '3px',
+    fontSize: '11px',
+    padding: '1px 4px',
+    lineHeight: 1.4,
+    backdropFilter: 'blur(2px)',
+  },
 } as const;