refactor: consolidate auth logic into helper, add letter E2E tests,

frontend/src/pages/Editor.tsx

@@ -273,6 +273,7 @@ export default function Editor() {
                 type="button"
                 className="btn btn-sm btn-circle btn-ghost absolute right-2 top-2"
                 onClick={() => setShareLink(null)}
+                aria-label="Close"
               >
                 <XCircleIcon size={18} weight="bold" />
               </button>

frontend/src/pages/Login.tsx

@@ -57,7 +57,7 @@ export default function Login() {
       });
 
       // store the auth related data
-      setAuthStore(authData.access, userData, masterKey);
+      await setAuthStore(authData.access, userData, masterKey);
 
       navigate(ROUTES.DRAWER);
     } catch (err) {