[FeatureRequest] Add alarm remove button

[turtton]

Is your feature request related to a problem? Please describe.
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その機能がほしくなった理由(こういう時に不便など)

Now, app cannot remove alarm.

Describe the solution you'd like
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追加してほしい機能についての説明

Remove existing alarm.

Describe alternatives you've considered
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上の方法以外の代替案があればここに

Additional context
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追加で書きたいことがあればここに

Add multi selection feature.