fix: revert radar pager to Transceivers tab, default minElev to 0

- Radar pager now defaults to Transceivers tab (initialPage=0)
- Transceivers don't auto-expand (selectedUuid defaults to null)
- Mutual page default minElev changed from settings value to 0.0
- Display filters out portions below the minElev threshold

feature/mutual/src/main/java/com/rtbishop/look4sat/feature/mutual/MutualViewModel.kt

@@ -66,13 +66,12 @@ class MutualViewModel(
         // and default min elevation to the same value used by the main radar passes
         val pos = settingsRepo.stationPosition.value
         val grid = latLonToGrid(pos.latitude, pos.longitude)
-        val minElev = settingsRepo.passesSettings.value.minElevation
         _uiState.update { it.copy(
             stationAGrid = grid,
             stationALat = "%.4f".format(pos.latitude),
             stationALon = "%.4f".format(pos.longitude),
-            stationAMinElev = minElev,
-            stationBMinElev = minElev
+            stationAMinElev = 0.0,
+            stationBMinElev = 0.0
         ) }
     }
 

feature/radar/src/main/java/com/rtbishop/look4sat/feature/radar/RadarScreen.kt

@@ -184,7 +184,7 @@ private fun PagerCard(
     modifier: Modifier = Modifier
 ) {
     val pages = RadarPage.entries
-    val pagerState = rememberPagerState(initialPage = 1, pageCount = { pages.size })
+    val pagerState = rememberPagerState(pageCount = { pages.size })
     val coroutineScope = rememberCoroutineScope()
 
     ElevatedCard(modifier = modifier) {