Summary

• Keep Settings focused on configuration only: threshold and the NSFW sound toggle.
• Move custom MP3 import into the Monitor sound control with one plus button, a one-time checkbox disclaimer, and an expandable Custom MP3s menu.
• Keep default sounds always available, add Whip as another built-in sound, and use Whip as the first-launch default.
• Gate first onboarding behind the existing availability check plus a real low-threshold sound test before the agreement can be accepted.
• Preserve the existing blue checking scanner, add a blue breathing state while waiting for the first slam, and finish with a green rotation/checkmark pulse.
• Let custom sounds be selected globally and removed with the minus control.

Validation

• DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer swift build
• DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer swift test
• DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer xcodebuild -scheme SlamDih -configuration Debug build