feat(mail): send goodbye notification email upon admin account deletion

[trtajim]

Summary

Sends a confirmation and goodbye email in Bengali reusing the existing emails.default layout when an administrator deletes a user account from the admin panel.

Details & Verification

• Template Reuse: Reuses emails.default without creating extra blade views, allowing HTML anchor links and adding link styling.
• Mailable: Created App\Mail\AccountDeletedMail taking primitive string data to prevent queued model deserialization failures upon record deletion.
• Content & Anchors:
  • Confirms account and personal data deletion per policy.
  • Anchored links for Privacy Policy (/privacy-policy) and Terms & Conditions (/terms-service).
  • Feature highlights with anchored links for Resource Archive (/), Forum (/forum), Global Chat (/chat), and Study Tracker (/tracker).
• Controller: Dispatches email to user's email before record deletion in AdminUserController::destroy.
• Tests: Added tests in tests/Feature/AdminUserDeletionMailTest.php.

Summary by CodeRabbit

• New Features
  • Users with an email address now receive a Bengali account-deletion email when an administrator deletes their account. The email includes relevant links and service information.
• Style
  • Links in email messages now appear underlined, semibold, and indigo.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 96d9bc0 and f99245b.

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📒 Files selected for processing (4)

• app/Http/Controllers/Admin/UserController.php
• app/Mail/AccountDeletedMail.php
• resources/views/emails/default.blade.php
• tests/Feature/AdminUserDeletionMailTest.php

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