- SettingsSearchMobile: change sm:hidden to lg:hidden to match mobile
layout breakpoint (search was invisible on 640-1023px tablets)
- SettingsTableRow: sync isLongValue suffixes with SettingInput
(_list, _json, _periods, _discounts were missing)
- SettingsTableRow: read-only bools now show enabled/disabled labels
instead of raw "true"/"false" strings
- Replace flat sidebar with collapsible tree groups (7 groups, 52 sub-items)
- Map all 61 backend category keys to sidebar navigation
- Add QuickToggles panel for boolean settings
- Replace card-style SettingRow with compact SettingsTableRow
- Add breadcrumb navigation for tree sub-items
- Add source badges (modified/DB/ENV) on settings
- Implement two-level mobile navigation with group chips
- Add i18n translations for all new keys (en, ru, zh, fa)