feat: redesign wallet login and favorites, fix desktop/mobile bugs

- Remove forced BNB chain switch on injected login (signature is chain-agnostic)
- Refine isMobileDevice so touch Macs stay on desktop flow
- Wire RainbowKit/WalletConnect as a real MetaMask/imToken QR fallback,
  gated on a valid VITE_WALLETCONNECT_PROJECT_ID
- Rebuild login modal: single desktop primary action, collapsible other
  methods, mobile open-app fallback feedback, brand icons
- Add My Favorites entry points (header, mobile menu, wallet dropdown)
- Favorites page: error retry, mobile filter drawer
- Auto sign-out and re-login prompt on favorites 401
- Full native translations for all wallet strings across 7 locales

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/favorites/api.ts

@@ -30,8 +30,23 @@ function authHeaders(token: string): HeadersInit {
   return { Authorization: `Bearer ${token}` };
 }
 
+/** HTTP error that preserves the status code so callers can react to 401s. */
+export class FavoriteHttpError extends Error {
+  readonly status: number;
+  constructor(status: number, message: string) {
+    super(message || `Request failed (${status})`);
+    this.name = "FavoriteHttpError";
+    this.status = status;
+  }
+}
+
+/** True when an error means the wallet session is no longer authorized. */
+export function isFavoritesAuthError(error: unknown): boolean {
+  return error instanceof FavoriteHttpError && error.status === 401;
+}
+
 async function parseJSON<T>(res: Response): Promise<T> {
-  if (!res.ok) throw new Error(await res.text());
+  if (!res.ok) throw new FavoriteHttpError(res.status, await res.text());
   return res.json() as Promise<T>;
 }