feat(mobile): add delete account function (#12688)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Introduced a "Delete my account" option in mobile settings with role-based warnings and confirmation modals.
- **Enhancements**
  - Added flexible row and reverse row layout options for modal footers and action buttons on mobile.
- **Localization**
  - Added English translation for the "Delete my account" setting.
- **Style**
  - Updated styles for modal footers and action buttons on mobile.
  - Added styling for account deletion dialog descriptions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/i18n/src/resources/en.json

@@ -685,6 +685,7 @@
   "com.affine.mobile.setting.others.terms": "Terms of use",
   "com.affine.mobile.setting.others.title": "Privacy & others",
   "com.affine.mobile.setting.others.website": "Official website",
+  "com.affine.mobile.setting.others.delete-account": "Delete my account",
   "com.affine.mobile.sign-in.skip.hint": "Want to keep data local?",
   "com.affine.mobile.sign-in.skip.link": "Start AFFiNE without an account",
   "com.affine.moreThan30Days": "Older than a month",