feat: implement timeout handling and error messages for image generation

frontend/tests/test_frontend.py

@@ -3,6 +3,8 @@ import os
 import pytest
 from unittest.mock import MagicMock, patch
 
+import httpx
+
 os.environ.setdefault("FLASK_SECRET_KEY", "test-secret")
 os.environ.setdefault("BACKEND_URL", "http://backend-mock")
 
@@ -311,6 +313,26 @@ def test_generate_image_success(client):
     assert b"example.com/img.png" in resp.data
 
 
+def test_generate_image_timeout_shows_message(client):
+    _set_auth(client)
+
+    def _request_side_effect(method, url, **kwargs):
+        if url.endswith("/generate/image"):
+            raise httpx.ReadTimeout("timed out")
+        if url.endswith("/auth/validate"):
+            return _mock_response(200, {"valid": True})
+        if url.endswith("/models/"):
+            return _mock_response(200, [{"id": "openai/dall-e-3", "name": "DALL-E", "modality": "image"}])
+        return _mock_response(200, {})
+
+    with patch("app.helpers.httpx.request", side_effect=_request_side_effect):
+        resp = client.post("/generate/image", data={
+            "model": "openai/dall-e-3", "prompt": "A cat", "n": "1", "size": "1024x1024"
+        })
+    assert resp.status_code == 200
+    assert b"timed out" in resp.data
+
+
 def test_generate_video_page_renders(client):
     _set_auth(client)
     resp = client.get("/generate/video")