Fix frontend UX: debounce saves, Zustand selectors, init race, dialog

- Debounce project config saves: use local state + save-on-blur instead
  of firing IPC requests on every keystroke in text inputs
- Add Zustand selectors to all store consumers to prevent full-store
  re-renders on any state change
- Fix initialization race: chain checkImage after checkDocker resolves
- Fix DockerSettings setTimeout race: await checkImage after save
- Add console.error logging to all 11 empty catch blocks in ProjectCard
- Add keyboard support to AddProjectDialog: Escape to close,
  click-outside-to-close, form submit on Enter, auto-focus

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src/components/settings/DockerSettings.tsx

@@ -33,8 +33,7 @@ export default function DockerSettings() {
   const handleSourceChange = async (source: ImageSource) => {
     if (!appSettings) return;
     await saveSettings({ ...appSettings, image_source: source });
-    // Re-check image existence after changing source
-    setTimeout(() => checkImage(), 100);
+    await checkImage();
   };
 
   const handleCustomChange = async (value: string) => {