v1.7.0: Audio Device Selection

Added

• Audio device selection support 🔊 (thanks @tkaufmann!)
  • Route notification sounds to a specific audio output device
  • New audioDevice config option in notifications.desktop section
  • New list-devices CLI tool to enumerate available audio devices
  • New --device flag for sound-preview utility

Changed

• Audio backend replacement - Replaced oto/v3 (beep/speaker) with malgo (miniaudio bindings)
  • Better cross-platform audio support
  • Native device enumeration and selection
  • More reliable playback on all platforms

Fixed

• Windows CI test failures - Fixed .exe extension handling in cross-platform tests
• Memory safety - DeviceID now properly copied instead of storing pointer to freed memory
• Player state check - Play() now returns error if player is already closed
• WaitGroup race condition - Added closing flag to prevent race between Close() and playSoundAsync()
• CI test resilience - Audio tests now skip gracefully in CI environments without audio backend

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Full Changelog: v1.6.6...v1.7.0