fix: resolve frontend lint issues

frontend/src/pages/MesGains.jsx

@@ -50,7 +50,20 @@ export default function MesGains() {
     }
   }, [handleAuthError])
 
-  useEffect(() => { fetchGains() }, [fetchGains])
+  useEffect(() => {
+  const loadGains = async () => {
+    try {
+      const data = await myGainsApi()
+      setGains(data.gains)
+    } catch (err) {
+      if (!handleAuthError(err)) setError(err.message)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  loadGains()
+}, [handleAuthError])
 
   return (
     <div className="min-h-screen bg-gray-50 flex flex-col px-8 py-12 max-w-lg mx-auto">