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

src/pages/Dump.tsx

@@ -84,10 +84,9 @@ export function Dump() {
       return () => controller.abort();
     }
 
-    setDumpState({ status: "loading" });
-    setOp(null);
-
     (async () => {
+      setDumpState({ status: "loading" });
+      setOp(null);
       try {
         const res = await fetch(`${API_URL}/api/dumps/${selectedDump}`, {
           cache: "no-store",
@@ -117,6 +116,9 @@ export function Dump() {
 
   useEffect(() => {
     if (!lastDumpEvent) return;
+    // Subscribing to the WS-pushed dump-update stream — setState here mirrors
+    // external state into local state, no synchronous alternative.
+    // eslint-disable-next-line react-hooks/set-state-in-effect
     setDumpState((prev) => {
       if (prev.status !== "loaded" || prev.dump.id !== lastDumpEvent.id) {
         return prev;
@@ -165,7 +167,10 @@ export function Dump() {
       !lastCommentEvent || !loadedDumpId ||
       lastCommentEvent.dumpId !== loadedDumpId
     ) return;
+    // Subscribing to the WS-pushed comment-event stream — setState here
+    // mirrors external state into local state, no synchronous alternative.
     if (lastCommentEvent.type === "created" && lastCommentEvent.comment) {
+      // eslint-disable-next-line react-hooks/set-state-in-effect
       setComments((prev) => {
         if (prev.some((c) => c.id === lastCommentEvent.comment!.id)) {
           return prev;
@@ -403,7 +408,14 @@ export function Dump() {
           {dump.kind === "file"
             ? <FilePreview dump={dump} global />
             : dump.richContent
-            ? <RichContentCard richContent={dump.richContent} />
+            ? (
+              <RichContentCard
+                richContent={dump.richContent}
+                thumbnailOverrideUrl={dump.thumbnailMime
+                  ? `${API_URL}/api/thumbnails/${dump.id}`
+                  : undefined}
+              />
+            )
             : (
               <a
                 href={dump.url}