fix: resolve missing mock method in profile modal tests

Added the missing `load()` method to the `hashtagPreferences` mock in `tests/profile-modal-controller.test.mjs`. This resolves the `TypeError` encountered during the `handleAddHashtagPreference` test case, ensuring the test suite passes consistently in CI.

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

tests/profile-modal-controller.test.mjs

@@ -274,6 +274,7 @@ function createController(options = {}) {
       return hashtagStore.disinterests.delete(normalized);
     },
     publish: async () => ({ ok: true }),
+    load: async () => true,
     on: () => () => {},
   };