feat: bind/unbind by id, video streaming proxy, unmute default, library refresh, hamburger click-outside

- Core API: bind/unbind accept id (integer PK) when face_id is null
- Tauri proxy: stream video responses instead of buffering for seek bar
- VideoPlayer: remove muted attribute, unmute by default
- LibraryView: call invalidateFiles() before ensureFiles() on register/unregister
- PeopleView: close sort panel on click-outside, not just hamburger toggle
- bind_face: prefer face_id, fallback to id when face_id is null

src/api/config.ts

@@ -0,0 +1,6 @@
+export const isTauri = typeof window !== 'undefined' && !!(window as any).__TAURI__
+
+export function getApiBase(): string {
+  if (isTauri) return ''
+  return localStorage.getItem('proxy_url') || window.location.origin
+}