feat: poll in-flight requests on native + refresh after submit (#369)

Native RequestsViewModel gains poll-while-approved (silent reloads, paused
when nothing in-flight) for parity with the web auto-poll, and the SSE
collector now reloads silently instead of flashing the loading spinner.
Web discover submit invalidates qk.myRequests() so a new request appears
on /requests immediately.

web/src/routes/discover/discover.test.ts

@@ -31,6 +31,15 @@ vi.mock('$lib/api/requests', () => ({
 
 vi.mock('$lib/api/client', () => apiClientMock());
 
+// The page calls useQueryClient() to invalidate qk.myRequests() after a
+// submit (#369); stub it so rendering doesn't require a real QueryClient and
+// we can assert the invalidation fires.
+const queryClientMock = vi.hoisted(() => ({ invalidateQueries: vi.fn() }));
+vi.mock('@tanstack/svelte-query', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('@tanstack/svelte-query')>();
+  return { ...actual, useQueryClient: () => queryClientMock };
+});
+
 import DiscoverPage from './+page.svelte';
 import { createLidarrSearchQuery } from '$lib/api/lidarr';
 import { createSuggestionsQuery } from '$lib/api/suggestions';
@@ -187,6 +196,27 @@ describe('Discover page', () => {
     });
   });
 
+  test('submitting a request invalidates myRequests so /requests updates (#369)', async () => {
+    vi.useFakeTimers();
+    const r = result({ mbid: 'art-mbid', artist_mbid: 'art-mbid', name: 'Boards of Canada' });
+    mockedCreateQuery.mockReturnValue(mockQuery<LidarrSearchResult[]>({ data: [r] }));
+    render(DiscoverPage);
+    const input = screen.getByLabelText(/search lidarr/i);
+    await fireEvent.input(input, { target: { value: 'boards' } });
+    await vi.advanceTimersByTimeAsync(250);
+    vi.useRealTimers();
+
+    const requestBtn = await screen.findByRole('button', {
+      name: /request boards of canada/i
+    });
+    await fireEvent.click(requestBtn);
+    await waitFor(() => {
+      expect(queryClientMock.invalidateQueries).toHaveBeenCalledWith({
+        queryKey: ['myRequests']
+      });
+    });
+  });
+
   test('track-kind Request click opens confirm modal; Confirm calls createRequest', async () => {
     vi.useFakeTimers();
     const r = result({