fix: ensure active feed refreshes when hashtag preferences change

* Update `refreshAllVideoGrids` in `js/app.js` to detect the currently active feed (For You, Kids, Explore, or Recent) and invoke the corresponding loader, preventing staleness when interacting with the UI.
* Refactor `HashtagPreferencesService` mutation methods (`addInterest`, etc.) to be `async` and await the `publish()` call, ensuring state is persisted before returning.
* Remove redundant `persistPreferencesFromMenu` call in `TagPreferenceMenuController`, relying on the service's internal persistence logic.
* Update unit tests for `HashtagPreferencesService` and `TagPreferenceMenuController` to align with the async behavior.

Co-authored-by: PR0M3TH3AN <[email protected]>

tests/ui/tagPreferenceMenuController.test.mjs

@@ -121,7 +121,7 @@ describe("TagPreferenceMenuController", () => {
   });
 
   describe("handleMenuAction", () => {
-    it("should call service method, notify update, publish, and notify update again", async () => {
+    it("should call service method and notify update", async () => {
       const tag = "bitcoin";
       const action = TAG_PREFERENCE_ACTIONS.ADD_INTEREST;
 
@@ -130,11 +130,11 @@ describe("TagPreferenceMenuController", () => {
       assert.strictEqual(mockHashtagPreferences.addInterest.mock.calls.length, 1);
       assert.strictEqual(mockHashtagPreferences.addInterest.mock.calls[0].arguments[0], tag);
 
-      // onPreferenceUpdate should be called twice (optimistic + confirmed)
-      assert.strictEqual(mockCallbacks.onPreferenceUpdate.mock.calls.length, 2);
+      // onPreferenceUpdate should be called once
+      assert.strictEqual(mockCallbacks.onPreferenceUpdate.mock.calls.length, 1);
 
-      // publish should be called
-      assert.strictEqual(mockHashtagPreferences.publish.mock.calls.length, 1);
+      // publish should not be called by controller directly
+      assert.strictEqual(mockHashtagPreferences.publish.mock.calls.length, 0);
     });
 
     it("should handle error and call showError", async () => {