fix: handle null Gitea current-user payload (#75)

src/main.py

@@ -75,6 +75,8 @@ async def context() -> JSONResponse:
             asyncio.gather(current_user(), repos(), issues(), pull_requests()),
             timeout=CONTEXT_TIMEOUT_SECONDS,
         )
+        if not isinstance(user_data, dict):
+            raise ValueError("Gitea current-user response was not an object")
     except Exception as e:
         error_message = (
             f"Gitea context request timed out after {CONTEXT_TIMEOUT_SECONDS:g}s"