fix: Handle vite:preloadError for graceful deployment asset updates (#6609)

## Summary
- Implement graceful handling of Vite preload errors that occur when
assets are deleted after new deployments
- Auto-reload when safe (no unsaved changes), show confirmation dialog
when user has unsaved work
- Add i18n support for user-friendly error messages

## Implementation Details
- Add `vite:preloadError` event listener in App.vue 
- Smart reload logic: check `app.vueAppReady` and
`workflowStore.activeWorkflow?.isModified`
- User confirmation dialog using existing `dialogService.confirm`
- Comprehensive i18n keys for title and message

## Background
This addresses the issue described in [Vite
documentation](https://vite.dev/guide/build.html#load-error-handling)
where users encounter import errors when hosting services delete old
assets after new deployments.

[screen-capture
(1).webm](https://github.com/user-attachments/assets/beed3b8e-6f32-4288-a560-55da391a79a1)

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

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6609-fix-Handle-vite-preloadError-for-graceful-deployment-asset-updates-2a36d73d365081a0b3adeac9fcd1e1dc)
by [Unito](https://www.unito.io)

src/locales/en/main.json

@@ -40,6 +40,8 @@
     "comfy": "Comfy",
     "refresh": "Refresh",
     "refreshNode": "Refresh Node",
+    "vitePreloadErrorTitle": "New Version Available",
+    "vitePreloadErrorMessage": "A new version of the app has been released. Would you like to reload?\nIf not, some parts of the app might not work as expected.\nFeel free to decline and save your progress before reloading.",
     "terminal": "Terminal",
     "logs": "Logs",
     "videoFailedToLoad": "Video failed to load",