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/useTerminal.ts

@@ -1,11 +1,20 @@
 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";
 
 export function useTerminal() {
   const { sessions, activeSessionId, addSession, removeSession, setActiveSession } =
-    useAppState();
+    useAppState(
+      useShallow(s => ({
+        sessions: s.sessions,
+        activeSessionId: s.activeSessionId,
+        addSession: s.addSession,
+        removeSession: s.removeSession,
+        setActiveSession: s.setActiveSession,
+      }))
+    );
 
   const open = useCallback(
     async (projectId: string, projectName: string) => {