Add audio notifications for Pomodoro intervals

[hughgramel]

Feature Request

Integrate audio pings/notifications for Pomodoro timer intervals to make reminders more noticeable.

Requirements

• Play audio notification when Pomodoro interval ends
• Play different sounds for:
  • Work interval ending (break time)
  • Break interval ending (back to work)
  • Long break
• Should work in voice channels when user is connected
• Fallback to text notifications if not in VC

Technical Considerations

• Discord.js supports audio through @discordjs/voice package
• Need to join voice channel to play audio
• Consider user preferences (some may want silent notifications)
• Audio files need to be short and non-intrusive
• May need voice connection management (joining/leaving channels)

Implementation Notes

• Add dependency: @discordjs/voice and libsodium-wrappers
• Store audio files in assets/sounds/ directory
• Add user setting to enable/disable audio notifications
• Bot needs Connect and Speak permissions in VC

Open Questions

• Should bot join VC automatically or only if user is already there?
• What sounds to use? (gentle chime vs alert tone)
• Should volume be configurable?

User Story

As a user in a voice channel, I want to hear audio notifications when my Pomodoro intervals end, so I don't miss the reminders.

Labels

enhancement, pomodoro, voice-integration, audio