[BUG] notification prompt

[Lysander086]

Bug Description

• when the user enters the application and doesn't want the permission to receive the notification we might need to use the toast notification to send the notification
• need to have the application explicitly ask the user to grant the notification permission.
• Add a default notification sound for the user.
• Integrate the vibration mode.

Steps to Reproduce

Steps to reproduce the behavior:

1. Add a timer
2. Wait until times up.

Expected Behavior

• notification and notification should be received when times up.

Actual Behavior

• none of the expectation is met.

Manual effort might be required

• need to find a good audio to be used.

[Lysander086]

@claude please help with PR creation and self verification

[Lysander086]

@claude please help with PR creation and self verification