fix(deps): update imports to use @lydell/node-pty directly

The previous commit (e1aee6a) updated package.json to use @lydell/node-pty
but the source files still imported from 'node-pty'. This caused the app
to fail on startup with "Cannot find module 'node-pty'" error.

This commit updates all imports and the vite external config to reference
@lydell/node-pty directly, completing the migration.

Files changed:
- src/main/terminal/pty-manager.ts
- src/main/terminal/pty-daemon.ts
- src/main/terminal/types.ts
- electron.vite.config.ts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

auto-claude-ui/electron.vite.config.ts

@@ -20,7 +20,7 @@ export default defineConfig({
           index: resolve(__dirname, 'src/main/index.ts')
         },
         // Only node-pty needs to be external (native module rebuilt by electron-builder)
-        external: ['node-pty']
+        external: ['@lydell/node-pty']
       }
     }
   },

auto-claude-ui/src/main/terminal/pty-daemon.ts

@@ -10,7 +10,7 @@
 
 import * as net from 'net';
 import * as fs from 'fs';
-import * as pty from 'node-pty';
+import * as pty from '@lydell/node-pty';
 
 const SOCKET_PATH =
   process.platform === 'win32'

auto-claude-ui/src/main/terminal/pty-manager.ts

@@ -3,7 +3,7 @@
  * Handles low-level PTY process creation and lifecycle
  */
 
-import * as pty from 'node-pty';
+import * as pty from '@lydell/node-pty';
 import * as os from 'os';
 import type { TerminalProcess, WindowGetter } from './types';
 import { IPC_CHANNELS } from '../../shared/constants';

auto-claude-ui/src/main/terminal/types.ts

@@ -1,4 +1,4 @@
-import type * as pty from 'node-pty';
+import type * as pty from '@lydell/node-pty';
 import type { BrowserWindow } from 'electron';
 
 /**