fix(ui): improve React Query hooks and fix edge cases

- Update query keys to include all relevant parameters (branches, agents)
- Fix use-branches to pass includeRemote parameter to query key
- Fix use-settings to include sources in agents query key
- Update running-agents-view to use correct query key structure
- Update use-spec-loading to properly use spec query hooks
- Add missing queryClient invalidation in auto-mode mutations
- Add missing cache invalidation in spec mutations after creation

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

apps/ui/src/hooks/mutations/use-spec-mutations.ts

@@ -157,6 +157,11 @@ export function useSaveSpec(projectPath: string) {
 
   return useMutation({
     mutationFn: async (content: string) => {
+      // Guard against empty projectPath to prevent writing to invalid locations
+      if (!projectPath || projectPath.trim() === '') {
+        throw new Error('Invalid project path: cannot save spec without a valid project');
+      }
+
       const api = getElectronAPI();
 
       await api.writeFile(`${projectPath}/.automaker/app_spec.txt`, content);