Ship native iOS app, Wiki/TTS backend, and skeleton loading UX.

Replace the WebView shell with SwiftUI screens, add account-scoped Wiki and TTS APIs with adaptive review and photo scan support, and keep web/iOS pages usable while data loads asynchronously.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/public/favicon.svg

@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64">
+  <defs>
+    <linearGradient id="bg" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" stop-color="#68c3ff" />
+      <stop offset="100%" stop-color="#4f6ef7" />
+    </linearGradient>
+  </defs>
+  <rect x="6" y="6" width="52" height="52" rx="16" fill="url(#bg)" />
+  <path
+    d="M18 18h8l6 24 6-16 6 16 6-24h8l-10 28h-8l-8-18-8 18h-8z"
+    fill="#fff"
+  />
+</svg>