Root cause: ChatArea.tsx called listen() from @tauri-apps/api/event
directly on component mount without checking isTauriRuntime(). When
accessed from a regular browser (not Tauri WebView), window.__TAURI_INTERNALS__
is undefined, causing "Cannot read properties of undefined (reading 'transformCallback')".
Solution:
- Created lib/safe-tauri.ts with safe wrappers (safeInvoke, safeListen,
safeListenEvent, requireInvoke) that gracefully degrade when Tauri
IPC is unavailable
- Replaced direct listen() call in ChatArea.tsx with safeListenEvent()
