Add Stop Alarm button to Alarm Bot

[bukulu-am]

Summary

This PR adds a "Stop Alarm" button to the Alarm Bot, allowing users to stop the ringing sound immediately. Previously, users had to close the entire application to stop the alarm. It also adds a seconds dropdown for more precise time setting.

Changes Made

• Added alarm_active global variable to control alarm state
• Created stop_alarm() function to stop the sound
• Added "Stop Alarm" button to the UI (red background for visibility)

Testing

• Set alarm for 1 minute ahead -> alarm rings -> Stop works
• Sound stops immediately when clicking Stop
• No errors on application close

Screenshot

(none)

Live Project Link

N/A - This is a desktop application

Developer Checklist

• Adhered to the guidelines outlined in the README & Contributing file.
• Maintained the correct directory structure (e.g., ProjectName/...yourfiles).
• Please ensure to include a README file for enhanced project clarity. (Alarm Bot already has README)
• Starred the repository (optional - done)

[github-actions]

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