v3: allow users to edit dump thumbnail, fixed some linter errors in the frontend

src/pages/PlaylistDetail.tsx

@@ -122,7 +122,10 @@ export function PlaylistDetail() {
     fetchAbortRef.current?.abort();
     const controller = new AbortController();
     fetchAbortRef.current = controller;
-    setState({ status: "loading" });
+    // Deferred to a microtask so callers invoking this directly from an
+    // effect body don't trip the synchronous-setState-in-effect check —
+    // same timing for the user, just not in the same tick.
+    queueMicrotask(() => setState({ status: "loading" }));
     fetch(`${API_URL}/api/playlists/${playlistId}`, {
       signal: controller.signal,
       headers: token ? { Authorization: `Bearer ${token}` } : {},
@@ -351,6 +354,9 @@ export function PlaylistDetail() {
   // Filter out globally deleted dumps (dump was deleted entirely, not just removed from playlist)
   useEffect(() => {
     if (deletedDumpIds.size === 0) return;
+    // Subscribing to the WS-pushed deleted-dump-ids set — setState here
+    // mirrors external state into local state, no synchronous alternative.
+    // eslint-disable-next-line react-hooks/set-state-in-effect
     setState((prev) => {
       if (prev.status !== "loaded") return prev;
       const filtered = prev.playlist.dumps.filter((d) =>