The `clearLine` and `writeLine` helpers use TTY-only methods (`clearLine`, `cursorTo`,
`moveCursor`) without checking `process.stdout.isTTY`, causing builds to crash in
non-interactive environments like CI or piped output.
See error I got in my CI environment:
```
vite v7.3.1 building ssr environment for production...
✗ Build failed in 7ms
✓ 0 modules transformed.
✗ Build failed in 9ms
error during build:
[vite:isolate-entries] Could not load virtual:isolate-entries:
[vite:transform-reporter] process.stdout.clearLine is not a function
```
