fix(web): ship degraded search readiness state

src/Web/StellaOps.Web/src/app/layout/global-search/global-search.component.ts

@@ -1407,11 +1407,13 @@ export class GlobalSearchComponent implements OnInit, OnDestroy {
           if (term.length < 1) {
             this.searchResponse.set(null);
             this.suggestionViability.set(null);
+            this.suggestionViabilityStatus.set('idle');
             this.isLoading.set(false);
             this.selectedIndex.set(0);
             return of(null);
           }
 
+          this.refreshSuggestionViability();
           this.isLoading.set(true);
           const ambient = this.buildAmbientSnapshot();
           return this.searchClient.search(term, undefined, 10, ambient).pipe(

src/Web/StellaOps.Web/tests/e2e/unified-search-experience-quality.e2e.spec.ts

@@ -363,6 +363,18 @@ test.describe('Unified Search - Experience Quality UX', () => {
   });
 
   test('shows search-readiness guidance instead of blaming the query when the live search corpus is unavailable', async ({ page }) => {
+    const zeroMatchResponse = {
+      ...emptyResponse('database connectivity'),
+      diagnostics: {
+        ftsMatches: 0,
+        vectorMatches: 0,
+        entityCardCount: 0,
+        durationMs: 38,
+        usedVector: true,
+        mode: 'hybrid',
+      },
+    };
+
     await page.unroute('**/api/v1/search/suggestions/evaluate');
     await page.route('**/api/v1/search/suggestions/evaluate', async (route) =>
       route.fulfill({
@@ -370,7 +382,7 @@ test.describe('Unified Search - Experience Quality UX', () => {
         body: '',
       }),
     );
-    await mockSearchResponses(page, () => emptyResponse('database connectivity'));
+    await mockSearchResponses(page, () => zeroMatchResponse);
 
     await page.goto('/releases/versions');
     await expect(page.locator('aside.sidebar')).toBeVisible({ timeout: 15_000 });