fix(portals): wait for the catalog before stating Discover availability

Triggering initializeContent() for the discover route was only half the
fix: TMDB usually answers before a cold catalog finishes importing, and
the content gate renders the route while that runs. The page dropped its
spinner as soon as the TMDB request settled, so cards computed against an
empty catalog claimed that titles the user owns are missing and their
clicks opened a search instead of the detail page.

Availability now waits for the catalog too. Readiness is keyed on what is
in flight rather than on isContentInitialized, mirroring the recently-added
route, so a failed import settles the page instead of spinning forever.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

libs/portal/xtream/feature/src/lib/discover/xtream-discover-route.component.ts

@@ -79,7 +79,26 @@ export class XtreamDiscoverRouteComponent {
     private readonly facetKey = computed(() => discoverFacetKey(this.facets()));
 
     private readonly results = signal<DiscoverTitle[]>([]);
-    readonly isLoading = signal(true);
+    private readonly isLoadingResults = signal(true);
+
+    /**
+     * TMDB usually answers before a cold catalog finishes importing, and
+     * the content gate renders this route while that runs. Publishing
+     * results against an empty catalog would state that titles the user
+     * owns are missing, so availability waits for the catalog too.
+     */
+    readonly isLoading = computed(
+        () => this.isLoadingResults() || !this.isCatalogReady()
+    );
+
+    // Keyed on what is in flight rather than on isContentInitialized, so
+    // a failed import settles the page instead of spinning forever
+    private readonly isCatalogReady = computed(
+        () =>
+            !this.xtreamStore.isLoadingContent() &&
+            !this.xtreamStore.isLoadingCategories() &&
+            !this.xtreamStore.isImporting()
+    );
 
     readonly showScopeToggle = this.titleMatch.isAvailable;
     readonly scope = signal<TitleResultsScope>('portal');
@@ -242,11 +261,11 @@ export class XtreamDiscoverRouteComponent {
         // with the SAME key, so recency — not the key — decides who may
         // commit: otherwise the older one's failure blanks valid results
         const token = this.discoverRequest.start();
-        this.isLoading.set(true);
+        this.isLoadingResults.set(true);
         this.globalMatches.set(null);
         if (!hasDiscoverFacet(facets)) {
             this.results.set([]);
-            this.isLoading.set(false);
+            this.isLoadingResults.set(false);
             return;
         }
         const titles = await this.tmdbEnrichment.discoverTitles(facets.type, {
@@ -258,7 +277,7 @@ export class XtreamDiscoverRouteComponent {
             return;
         }
         this.results.set(titles ?? []);
-        this.isLoading.set(false);
+        this.isLoadingResults.set(false);
         if (this.scope() === 'global') {
             void this.loadGlobalMatches();
         }