feat(app): sync backend config on app initialization

- Call syncConfigStoreFromBackend() on app mount
- Export __testables from smart-search for testing
- Complements configStore refactoring

ccw/src/tools/smart-search.ts

@@ -3159,6 +3159,12 @@ export async function handler(params: Record<string, unknown>): Promise<ToolResu
  * @param params - Search parameters (path, languages, force)
  * @param onProgress - Optional callback for progress updates
  */
+export const __testables = {
+  parseCodexLensJsonOutput,
+  parsePlainTextFileMatches,
+  hasCentralizedVectorArtifacts,
+};
+
 export async function executeInitWithProgress(
   params: Record<string, unknown>,
   onProgress?: (progress: ProgressInfo) => void