feat:#684 - Delete account

[sana7044]

🛠 Description

This PR implements the ability for users to delete their own accounts directly from the Settings page.

Changes

• Added a "Delete Account" button to the Settings page UI.
• Clicking the button opens a confirmation dialog to prevent accidental deletions.
• Integrated a confirmation dialog requiring users to type "DELETE" to confirm account deletion, reducing accidental actions.
• Implemented account deletion from Firebase Authentication and associated Firestore data.
• Ensures the user is automatically logged out post-deletion.
• Added a success notification upon successful account deletion.

Fixes #684

✨ Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

🧠 Rationale behind the change

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🧪 All Test Suites Passed?

• Manual tested
• Cypress

📸 Screenshots (optional)

🏎 Quick checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

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