feat: Add swipe to delete notifications

[SarthakKharche]

PR Description

Adds swipe-to-delete interaction to notification list items. Users can swipe a notification from right to left to reveal a red delete action; tapping it removes the item immediately from the list. An undo snackbar appears post-deletion, allowing users to restore the notification within a short timeout. List state updates optimistically, and only one swipe row can remain open at a time.

Type of Change

• Bug fix (change which fixes an issue)
• New feature (change which adds functionality)
• Documentation update

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• Frontend
• Backend
• Documentation
• Others

Related Issue

Closes #1066

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Fixes (mention the issue number which this fixes)

closes #1066

Checklist

• I have updated my branch and synced it with the project's 'develop' branch before making this PR.
• I have optimized the file changes.
• I have added a snapshot of my work example.
• I have made a PR to the project's develop branch.

Undertaking

• My code follows the style guidelines of this project.

• I have performed a self-review of my code.

• I have commented my code, particularly in hard-to-understand areas.

• I have made corresponding changes to the documentation.

• I have checked for plagiarism and assure its authenticity.

• I have read and followed the code of conduct for this repository. I understand that violation of this undertaking may have legal consequences.

• I Agree

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[github-actions]

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