Make image upload guidance wrapper-independent

Map image-only generation failures to the notice upload warning without relying on exception text hidden by the ZeroGPU wrapper.

Co-authored-by: Codex <codex@openai.com>

app/service.py

@@ -204,11 +204,7 @@ def analyze_notice(
         if "ZeroGPU quota" in exc_text or "exceeded your ZeroGPU" in exc_text:
             message = "GPU quota exceeded. Please try again later or authenticate with a Hugging Face token for more quota."
             error_code = "gpuQuotaError"
-        elif (
-            image_data_url
-            and not text
-            and "invalid response" in exc_text.lower()
-        ):
+        elif image_data_url and not text:
             return notice_image_warning(status)
         else:
             message = "The local model returned an invalid response. Please try again."

tests/test_tracing.py

@@ -426,9 +426,7 @@ class TraceTests(unittest.TestCase):
             return_value={"connected": True, "label": "ready"},
         ), patch(
             "app.model_endpoint.call_model",
-            side_effect=RuntimeError(
-                "The local model returned an invalid response."
-            ),
+            side_effect=RuntimeError("sanitized ZeroGPU worker failure"),
         ):
             result = app.analyze_notice(
                 image_data_url="data:image/png;base64,AAAA",