fix: suppress unhandled promise rejections from fire-and-forget useEffect loads

useAsync re-throws errors after storing them in state — correct for awaited
callers but causes unhandled rejections when load() is called without .catch()
in useEffects. The error is already captured in AsyncState.Error so the
re-throw provides no additional value in these fire-and-forget patterns.

Fixes JAVASCRIPT-REACT-M (Sentry: Media download failed: 401 Unauthorized)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/hooks/useAsyncCallback.ts

@@ -114,7 +114,7 @@ export const useAsyncCallbackValue = <TData, TError>(
   const [state, load] = useAsyncCallback<TData, TError, []>(asyncCallback);
 
   useEffect(() => {
-    load();
+    void load().catch(() => undefined);
   }, [load]);
 
   return [state, load];