* feat(mailbox): add list view mode
- Add a toggleable list view for the mailbox, with a settings option and back button.
- deselect mail on second click in list view
- set current mail on row click in multi-action mode
* feat(mailbox): add configurable body preview line clamp
Allow users to set the number of preview lines (0–5) for mail body in the list view via a slider in Appearance settings. Includes i18n support for the new option and its "Off" state.
* chore: clarify some i18n message in settings
include the following changes:
- The original "Mailbox Split Size" to "Left list width in two-column mailbox view"
- The description of new feature "Full-width mailbox list view"
sync all languages with the updated message
* docs: update changelog with recent UI improvements
- Added mailbox full-width list view and body preview lines settings
- Extended left panel width ratio range to 0
- Included English changelog translations
* docs: fix CHANGELOG improvements types
* fix: enable mail list preview line clamp settings on mobile