Fix for TanStack Router + Vite EPERM Race Condition During Route Generation

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Developers using TanStack Router with Vite may encounter an EPERM (operation not permitted) error when creating new routes, caused by a race condition in the file watcher. The error occurs when Vite's file watcher attempts to rename temporary files before the write operation is complete. Adding usePolling and awaitWriteFinish settings to the server.watch block in vite.config.ts resolves the issue by giving the file system time to stabilize. The fix works regardless of operating system or hardware configuration, though the stabilityThreshold value may need to be increased when generating multiple routes simultaneously. While the polling approach slightly slows the dev server, it prevents the server from crashing during route creation.

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