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/layout/Sidebar.tsx

@@ -1,9 +1,12 @@
+import { useShallow } from "zustand/react/shallow";
 import { useAppState } from "../../store/appState";
 import ProjectList from "../projects/ProjectList";
 import SettingsPanel from "../settings/SettingsPanel";
 
 export default function Sidebar() {
-  const { sidebarView, setSidebarView } = useAppState();
+  const { sidebarView, setSidebarView } = useAppState(
+    useShallow(s => ({ sidebarView: s.sidebarView, setSidebarView: s.setSidebarView }))
+  );
 
   return (
     <div className="flex flex-col h-full w-[25%] min-w-56 max-w-80 bg-[var(--bg-secondary)] border border-[var(--border-color)] rounded-lg overflow-hidden">