feat(lotw): auto-sync grids on app start with separate toggle

Mirrors the ephemeris auto-update check: on every app start, if LoTW
credentials are configured, the new 'auto-sync LoTW grids' toggle is on,
at least one manual sync was done before, and today has not synced yet
(ARRL rate limit, ~once a day), pull confirmations since the last sync
and merge them. Same callsign -> incremental merge; callsign change ->
full replace. Manual dialog and automatic path share the orchestration
(mode resolution, gate, merge/persist) moved to core:domain
LoTWGridSync.kt; LoTWSyncMode moved to core:domain. 8 unit tests.

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/SettingsRepo.kt

@@ -77,6 +77,7 @@ class SettingsRepo(
     private val keySelectedTypes = "selectedTypes"
     private val keySelectedModes = "selectedModes"
     private val keyStateOfAutoUpdate = "stateOfAutoUpdate"
+    private val keyStateOfAutoLotwSync = "stateOfAutoLotwSync"
     private val keyStateOfSensors = "stateOfSensors"
     private val keyStateOfSweep = "stateOfSweep"
     private val keyStateOfUtc = "stateOfUtc"
@@ -538,6 +539,7 @@ class SettingsRepo(
             val new = transform(current)
             preferences.edit {
                 putBoolean(keyStateOfAutoUpdate, new.stateOfAutoUpdate)
+                putBoolean(keyStateOfAutoLotwSync, new.stateOfAutoLotwSync)
                 putBoolean(keyStateOfSensors, new.stateOfSensors)
                 putBoolean(keyStateOfSweep, new.stateOfSweep)
                 putBoolean(keyStateOfUtc, new.stateOfUtc)
@@ -556,6 +558,7 @@ class SettingsRepo(
 
     private fun getOtherSettings(): OtherSettings = OtherSettings(
         stateOfAutoUpdate = preferences.getBoolean(keyStateOfAutoUpdate, true),
+        stateOfAutoLotwSync = preferences.getBoolean(keyStateOfAutoLotwSync, true),
         stateOfSensors = preferences.getBoolean(keyStateOfSensors, true),
         stateOfSweep = preferences.getBoolean(keyStateOfSweep, true),
         stateOfUtc = preferences.getBoolean(keyStateOfUtc, false),