feat(anime): add anime browser powered by Aniyomi extensions

- Add `subminer anime` / `--anime` and a tray entry to open a browser that searches installed Aniyomi extension sources, shows cover art and episodes, and plays into mpv with overlay/mining attached
- Add an Extensions tab to add repos and install/update/remove sources, and per-source settings for sources needing config
- Support searching all sources at once with streaming, per-source results and status
- Prefer Japanese audio/subtitle tracks from the source and keep the primary subtitle slot reserved for Japanese
- Fix window/tray/Dock handling so the browser and mpv can be switched between without quitting the app or losing the Dock icon
- Add anime.repos, anime.extensionsDir, anime.preferredQuality config keys (no bundled repos or discovery)

src/main/runtime/setup-window-factory.ts

@@ -99,3 +99,19 @@ export function createCreateSyncUiWindowHandler<TWindow>(deps: {
     backgroundColor: '#24273a',
   });
 }
+
+export function createCreateAnimeBrowserWindowHandler<TWindow>(deps: {
+  createBrowserWindow: (options: Electron.BrowserWindowConstructorOptions) => TWindow;
+  preloadPath: string;
+}) {
+  return createSetupWindowHandler(deps, {
+    // Wider than the other surfaces: this one is a cover-art grid.
+    width: 1180,
+    height: 820,
+    title: 'SubMiner Anime',
+    show: false,
+    resizable: true,
+    preloadPath: deps.preloadPath,
+    backgroundColor: '#24273a',
+  });
+}