feat(map,mutual): uppercase callsign input; mutual match honors historical pass window

- MapScreen: mark-a-station callsign input uppercases as you type
- MutualViewModel: read passesSettings.hoursBefore, shift the mutual
  match query start to now-hoursBefore so historical passes are
  included when the main Passes page has a lookback window set;
  endTime stays at now+hoursAhead

feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapScreen.kt

@@ -561,7 +561,7 @@ private fun WorkedGridQsoDialog(
             text = {
                 androidx.compose.material3.OutlinedTextField(
                     value = callInput,
-                    onValueChange = { callInput = it },
+                    onValueChange = { callInput = it.uppercase() },
                     label = { Text(stringResource(R.string.grid_mark_callsign)) },
                     singleLine = true
                 )