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/core/services/dock-icon-visibility.test.ts

@@ -0,0 +1,72 @@
+import assert from 'node:assert/strict';
+import test, { beforeEach } from 'node:test';
+import {
+  isDockIconRetained,
+  releaseDockIcon,
+  resetDockIconRetentionForTests,
+  retainDockIcon,
+} from './dock-icon-visibility';
+
+function createDockRecorder() {
+  const calls: string[] = [];
+  return {
+    calls,
+    dock: {
+      show: () => {
+        calls.push('show');
+      },
+      hide: () => {
+        calls.push('hide');
+      },
+    },
+  };
+}
+
+beforeEach(() => {
+  resetDockIconRetentionForTests();
+});
+
+test('retainDockIcon shows the dock once and marks retention on darwin', () => {
+  const recorder = createDockRecorder();
+
+  retainDockIcon({ dock: recorder.dock, platform: 'darwin' });
+  retainDockIcon({ dock: recorder.dock, platform: 'darwin' });
+
+  assert.deepEqual(recorder.calls, ['show']);
+  assert.equal(isDockIconRetained(), true);
+});
+
+test('releaseDockIcon rehides only when the last retainer releases and overlay still needs it', () => {
+  const recorder = createDockRecorder();
+
+  retainDockIcon({ dock: recorder.dock, platform: 'darwin' });
+  retainDockIcon({ dock: recorder.dock, platform: 'darwin' });
+  releaseDockIcon({ dock: recorder.dock, platform: 'darwin', shouldRehide: () => true });
+  assert.deepEqual(recorder.calls, ['show']);
+  assert.equal(isDockIconRetained(), true);
+
+  releaseDockIcon({ dock: recorder.dock, platform: 'darwin', shouldRehide: () => true });
+  assert.deepEqual(recorder.calls, ['show', 'hide']);
+  assert.equal(isDockIconRetained(), false);
+});
+
+test('releaseDockIcon leaves the dock visible when no overlay needs the accessory transform', () => {
+  const recorder = createDockRecorder();
+
+  retainDockIcon({ dock: recorder.dock, platform: 'darwin' });
+  releaseDockIcon({ dock: recorder.dock, platform: 'darwin', shouldRehide: () => false });
+
+  assert.deepEqual(recorder.calls, ['show']);
+  assert.equal(isDockIconRetained(), false);
+});
+
+test('release without retain and non-darwin platforms are no-ops', () => {
+  const recorder = createDockRecorder();
+
+  releaseDockIcon({ dock: recorder.dock, platform: 'darwin', shouldRehide: () => true });
+  retainDockIcon({ dock: recorder.dock, platform: 'linux' });
+  releaseDockIcon({ dock: recorder.dock, platform: 'win32', shouldRehide: () => true });
+
+  assert.deepEqual(recorder.calls, []);
+  assert.equal(isDockIconRetained(), false);
+});