fix(notifications): gate overlay delivery on visible overlay; default to

- Default notificationType fallback changed from 'overlay' to 'osd'
- isVisibleOverlayContentReady guards on overlay visible + window ready
- All overlay hide paths dismiss loading OSD notification
- notifyConfiguredStatus falls back to desktop when overlay not ready
- anilist deps builder preserves undefined optional callbacks as undefined
- settingsEnumValues field added to ConfigOptionRegistryEntry
- Drop !important from z-index; lower yomitan popup z-index below notification stack

src/main/runtime/anilist-setup-protocol-main-deps.test.ts

@@ -23,6 +23,18 @@ test('notify anilist setup main deps builder maps callbacks', () => {
   assert.deepEqual(calls, ['osd:ok', 'notify:SubMiner', 'log:done']);
 });
 
+test('notify anilist setup main deps builder preserves optional notification callbacks', () => {
+  const deps = createBuildNotifyAnilistSetupMainDepsHandler({
+    hasMpvClient: () => true,
+    showMpvOsd: () => {},
+    showDesktopNotification: () => {},
+    logInfo: () => {},
+  })();
+
+  assert.equal(deps.getNotificationType, undefined);
+  assert.equal(deps.showOverlayNotification, undefined);
+});
+
 test('consume anilist setup token main deps builder maps callbacks', () => {
   const calls: string[] = [];
   const deps = createBuildConsumeAnilistSetupTokenFromUrlMainDepsHandler({