fix: handle UNAUTHORIZED responses by clearing session and reloading

frontend/src/lib/gql.ts

@@ -16,9 +16,16 @@ export async function gql<T = unknown>(
     body: JSON.stringify({ query, variables }),
   })
 
-  const json = await res.json()
+    const json = await res.json()
   if (json.errors?.length) {
+    if (json.errors[0].message === 'UNAUTHORIZED') {
+      localStorage.removeItem('token')
+      localStorage.removeItem('username')
+      window.location.href = '/'
+    }
     throw new Error(json.errors[0].message)
   }
   return json.data as T
 }
+
+