test(FN-2532): expand SettingsModal remote access coverage

- Add Step 1 tests for remote provider selection and lifecycle state handling in SettingsModal
- Add Step 2 tests for remote token flows plus URL and QR rendering/validation scenarios
- Refactor existing SettingsModal test structure to reduce duplication and improve remote settings assertions
- Strengthen regression coverage for remote access UX edge cases in dashboard settings

packages/core/src/__tests__/store.test.ts

@@ -48,6 +48,12 @@ describe("TaskStore", () => {
   });
 
   afterEach(async () => {
+    // Some watcher/polling tests can leave an in-flight poll tick queued right
+    // before teardown. Stop watching first and yield once so pending callbacks
+    // settle before removing temp dirs.
+    store.stopWatching();
+    await new Promise<void>((resolve) => setImmediate(resolve));
+
     store.close();
     await rm(rootDir, { recursive: true, force: true, maxRetries: 5, retryDelay: 50 });
     await rm(globalDir, { recursive: true, force: true, maxRetries: 5, retryDelay: 50 });