Improve global search

Add options to show only searches for
- pinned sources
- all sources
- sources with results

src/modules/browse/Browse.types.ts

@@ -13,4 +13,5 @@ export type MetadataBrowseSettings = {
     extensionLanguages: string[];
     showNsfw: boolean;
     lastUsedSourceId: SourceIdInfo['id'] | null;
+    shouldShowOnlySourcesWithResults: boolean;
 };