fix(search): Race-Guard-Test korrekt auf in-flight abzielen

Der vorherige Test setzte query NACH dem Fetch-Abschluss und erzwang
dafuer einen setter-Side-Effect, der bei normalem Tippen die Treffer
waehrend des Debounce-Fensters fuer 300ms leer geblitzt haette.

Jetzt: echter Race-Test mit manuell aufloesbarem fetch. Setter-Nebenwirkung
entfernt, query ist wieder plain \$state.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/unit/search-store.test.ts

@@ -66,18 +66,46 @@ describe('SearchStore', () => {
     expect(store.webPageno).toBe(1);
   });
 
-  it('races-guards: stale response discarded when query changed mid-flight', async () => {
+  it('race-guard: fetch response discarded when query changed mid-flight', async () => {
     vi.useFakeTimers();
-    const fetchImpl = mockFetch([
-      { body: { hits: [{ id: 99, title: 'Stale', description: null, image_path: null, source_domain: null, avg_stars: null, last_cooked_at: null }] } }
-    ]);
+    let resolveFetch!: (v: Response) => void;
+    const fetchImpl = vi.fn(
+      () =>
+        new Promise<Response>((resolve) => {
+          resolveFetch = resolve;
+        })
+    );
     const store = new SearchStore({ fetchImpl, debounceMs: 10 });
     store.query = 'stale-query';
     store.runDebounced(store.query);
     await vi.advanceTimersByTimeAsync(15);
+    expect(fetchImpl).toHaveBeenCalledTimes(1);
+    // User keeps typing BEFORE the response arrives — race-guard should kick in
+    // when the fetch finally resolves.
     store.query = 'different';
-    await vi.waitFor(() => expect(fetchImpl).toHaveBeenCalled());
+    resolveFetch({
+      ok: true,
+      status: 200,
+      json: async () => ({
+        hits: [
+          {
+            id: 99,
+            title: 'Stale',
+            description: null,
+            image_path: null,
+            source_domain: null,
+            avg_stars: null,
+            last_cooked_at: null
+          }
+        ]
+      })
+    } as Response);
+    // Flush microtasks so the awaited response + race-guard run.
+    await vi.runOnlyPendingTimersAsync();
+    await Promise.resolve();
+    await Promise.resolve();
     expect(store.hits).toEqual([]);
+    expect(store.searchedFor).toBeNull();
   });
 
   it('loadMore: drains local first (offset pagination)', async () => {