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/hooks/useDocker.ts

@@ -1,4 +1,5 @@
 import { useCallback } from "react";
+import { useShallow } from "zustand/react/shallow";
 import { listen } from "@tauri-apps/api/event";
 import { useAppState } from "../store/appState";
 import * as commands from "../lib/tauri-commands";
@@ -9,7 +10,14 @@ export function useDocker() {
     setDockerAvailable,
     imageExists,
     setImageExists,
-  } = useAppState();
+  } = useAppState(
+    useShallow(s => ({
+      dockerAvailable: s.dockerAvailable,
+      setDockerAvailable: s.setDockerAvailable,
+      imageExists: s.imageExists,
+      setImageExists: s.setImageExists,
+    }))
+  );
 
   const checkDocker = useCallback(async () => {
     try {