WHAT

Implement a "watch" mode that automatically triggers retranslation when changes are detected in the source file.

WHY

• Saves time by eliminating manual retranslation after each edit
• Improves workflow for users working on iterative translations
• Keeps target language files in sync with source file changes

HOW

1. Monitor specified source file for changes via lingo.dev run --watch
2. When changes detected, trigger retranslation process
3. Implement debounce mechanism to avoid excessive retranslations on rapid changes

Additional Context

No response