- Replace "Toggle" menu with status indicator and Enable/Disable action
- Add visual feedback for active/inactive states (filled vs empty keyboard icon with opacity)
- Convert all Korean strings to English in UI and README
- Fix accessibility permission check logic to avoid repeated prompts
- Update bundle identifier to com.xncbf.HappyHackingKeybinder
- Add main.swift for proper app lifecycle management

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