[web] Fix race condition in initialization of search worker

During app init, two worker instances would get created in some cases and two
getInstances raced because of the await. This was causing the search results to
be empty until the page is reloaded (since the files array was empty in the
worker that got assigned, but the files would get set to the other worker
instance that lost the race).

web/apps/photos/src/utils/comlink/ComlinkSearchWorker.ts

@@ -5,11 +5,13 @@ import { type DedicatedSearchWorker } from "worker/search.worker";
 
 class ComlinkSearchWorker {
     private comlinkWorkerInstance: Remote<DedicatedSearchWorker>;
+    private comlinkWorker: ComlinkWorker<typeof DedicatedSearchWorker>;
 
     async getInstance() {
         if (!this.comlinkWorkerInstance) {
-            this.comlinkWorkerInstance =
-                await getDedicatedSearchWorker().remote;
+            if (!this.comlinkWorker)
+                this.comlinkWorker = getDedicatedSearchWorker();
+            this.comlinkWorkerInstance = await this.comlinkWorker.remote;
         }
         return this.comlinkWorkerInstance;
     }