research UI: fix 3 lint errors — async wrapper + escape apostrophe

Push right after ec1ddc6 tripped three eslint errors on the same-commit
lint pass. All three are cosmetic in behavior:

- ResearchList.tsx:48 + ResearchCanvas.tsx:64 — setState was called
  synchronously at the top of a useEffect. Wrap the body in an inner
  async load() and call setState inside it; effect still returns the
  cleanup for the alive-flag guard.
- ResearchWizard.tsx:207 — bare apostrophe in JSX text ("workspace's").
  Replace with ' to satisfy react/no-unescaped-entities.

frontend/src/components/dashboard/ResearchCanvas.tsx

@@ -65,18 +65,19 @@ export function ResearchCanvas({
       return;
     }
     let alive = true;
-    setLoading(true);
-    setError(null);
-    getTopic(selectedId)
-      .then((d) => {
+    const load = async () => {
+      setLoading(true);
+      setError(null);
+      try {
+        const d = await getTopic(selectedId);
         if (alive) setTopic(d);
-      })
-      .catch((e) => {
+      } catch (e) {
         if (alive) setError(e instanceof Error ? e.message : "load failed");
-      })
-      .finally(() => {
+      } finally {
         if (alive) setLoading(false);
-      });
+      }
+    };
+    load();
     return () => {
       alive = false;
     };