fix(ecommerce): video 400 error — use OSS URLs instead of data URLs for video generation

The renderScene function was passing local data URLs (data:image/png;base64,...)
as imageUrl and referenceUrls to createVideoTask, which the /api/ai/video endpoint
rejects with 400 Bad Request. The planning phase already uploads images to OSS
but the resulting URLs were not returned to the component.

- Add imageUrls field to EcommerceVideoPlanResult
- Return OSS imageUrls from runVideoPlan alongside existing plan data
- Use planResult.imageUrls[0] in handleRender instead of productImageDataUrls[0]
- Use planResult?.imageUrls[0] for sourceImage display fallback

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/App.tsx

@@ -362,7 +362,7 @@ function App() {
   }, [clearSessionState, setProjects, setProjectsLoaded, setUsage, clearTasks, setRuntimeNotifications, setServerNotifications, setCanvasWorkflow, setCurrentCanvasProjectId, setWorkspaceExpanded, handleSetView]);
 
   const showSessionReplacedModal = useCallback((message?: string) => {
-    clearAuthenticatedState();
+    clearAuthenticatedState({ resetView: true });
     showSessionReplaced(message);
   }, [clearAuthenticatedState, showSessionReplaced]);