# NTP Sync Clock Feature

## Task
Add a "Sync Clock" action to the Clock settings category that connects to WiFi and performs NTP time synchronization.

## Changes Made

### New Files
- **src/activities/settings/NtpSyncActivity.h** - Activity class extending `ActivityWithSubactivity` with states: WIFI_SELECTION, SYNCING, SUCCESS, FAILED
- **src/activities/settings/NtpSyncActivity.cpp** - Full implementation:
  - Launches `WifiSelectionActivity` with auto-connect enabled
  - On WiFi connect: blocking `waitForNtpSync(8000ms)`
  - Shows synced time on success; auto-dismisses after 5 seconds
  - Failed state requires manual Back press
  - Clean WiFi teardown in `onExit()`

### Modified Files
- **src/activities/settings/SettingsActivity.h** - Added `SyncClock` to `SettingAction` enum
- **src/activities/settings/SettingsActivity.cpp** - Added include, switch case handler, and action in `rebuildClockActions()`
- **lib/I18n/translations/*.yaml** (all 9 files) - Added `STR_SYNC_CLOCK` and `STR_TIME_SYNCED` string keys
- **lib/I18n/I18nKeys.h, I18nStrings.h, I18nStrings.cpp** - Regenerated from YAML

## Build Result
SUCCESS - RAM: 32.7%, Flash: 70.7%

## Follow-up Items
- Non-English translations use English fallback values; translators can update later