Reorders SettingsScreen's top-level (non-Advanced) sections per #158:
Accounts, Message downloading, Contacts, Appearance, Settings Backup,
Notifications, Storage on this device, then a header-less trailing
Report a Problem row (mirrors AccountSettingsScreen's headerless
"Remove account" row now that Diagnostics is down to one item).
- Move "Message downloading" up to directly follow Accounts.
- Add a two-line descriptive subtext under the Appearance header
("Match device theme" / "Material You theming (Android 12+)"); no
new toggle, since LibreMailTheme already always follows the system
light/dark setting via isSystemInDarkTheme().
- Rename settings_backup "Backup" -> "Settings Backup" and
settings_new_mail "New-mail notifications" -> "New mail
notifications" (drop hyphen).
- Drop the now-single-item settings_diagnostics header string; keep
Contacts positioned directly before Appearance (its prior relative
spot), per the ticket's suggested safest default for the
unresolved placement question.
Advanced's internal order is untouched (out of scope; tracked by
#162).
Closes#158
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>