fix: prevent "No App Specification Found" during spec generation

Check generation status before trying to load the spec file.
This prevents 500 errors and confusing UI during spec generation.

Changes:
- useSpecLoading now checks specRegeneration.status() first
- If generation is running, skip the file read and set isGenerationRunning
- SpecView uses isGenerationRunning to show generating UI properly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/src/components/views/spec-view/hooks/use-spec-loading.ts

@@ -9,6 +9,7 @@ export function useSpecLoading() {
   const { currentProject, setAppSpec } = useAppStore();
   const [isLoading, setIsLoading] = useState(true);
   const [specExists, setSpecExists] = useState(true);
+  const [isGenerationRunning, setIsGenerationRunning] = useState(false);
 
   const loadSpec = useCallback(async () => {
     if (!currentProject) return;
@@ -16,6 +17,20 @@ export function useSpecLoading() {
     setIsLoading(true);
     try {
       const api = getElectronAPI();
+
+      // Check if spec generation is running before trying to load
+      // This prevents showing "No App Specification Found" during generation
+      if (api.specRegeneration) {
+        const status = await api.specRegeneration.status();
+        if (status.success && status.isRunning) {
+          logger.debug('Spec generation is running, skipping load');
+          setIsGenerationRunning(true);
+          setIsLoading(false);
+          return;
+        }
+        setIsGenerationRunning(false);
+      }
+
       const result = await api.readFile(`${currentProject.path}/.automaker/app_spec.txt`);
 
       if (result.success && result.content) {
@@ -42,6 +57,7 @@ export function useSpecLoading() {
     isLoading,
     specExists,
     setSpecExists,
+    isGenerationRunning,
     loadSpec,
   };
 }