feat: default pager to SSTV, remove radar plot drag, filter B track by elevation>0

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

@@ -18,8 +18,6 @@
 package com.rtbishop.look4sat.feature.mutual
 
 import androidx.compose.foundation.Canvas
-import androidx.compose.foundation.gestures.detectDragGestures
-import androidx.compose.foundation.gestures.detectTapGestures
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
@@ -36,7 +34,6 @@ import androidx.compose.ui.graphics.Path
 import androidx.compose.ui.graphics.PathEffect
 import androidx.compose.ui.graphics.drawscope.DrawScope
 import androidx.compose.ui.graphics.drawscope.Stroke
-import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.text.TextMeasurer
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.drawText
@@ -60,7 +57,6 @@ private const val STROKE_WIDTH = 2.5f
 fun MutualRadarView(
     trackSamples: List<TrackSample>,
     progress: Float = 0.5f,
-    onProgressChange: (Float) -> Unit = {},
     labelA: String = "站点A",
     labelB: String = "站点B",
     modifier: Modifier = Modifier
@@ -86,16 +82,6 @@ fun MutualRadarView(
                 .fillMaxWidth()
                 .aspectRatio(1f)
                 .padding(4.dp)
-                .pointerInput(Unit) {
-                    detectTapGestures { offset ->
-                        onProgressChange((offset.x / size.width.toFloat()).coerceIn(0f, 1f))
-                    }
-                }
-                .pointerInput(Unit) {
-                    detectDragGestures { change, _ ->
-                        onProgressChange((change.position.x / size.width.toFloat()).coerceIn(0f, 1f))
-                    }
-                }
         ) {
             val radius = size.minDimension / 2f * 0.92f
             val center = Offset(size.width / 2f, size.height / 2f)

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

@@ -433,7 +433,6 @@ private fun MutualPassCard(
                         MutualRadarView(
                             trackSamples = pass.trackSamples,
                             progress = dragProgress,
-                            onProgressChange = { dragProgress = it },
                             labelA = "你",
                             labelB = "友台"
                         )

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

@@ -118,16 +118,18 @@ private fun RadarScreen(
     val addToCalendar: () -> Unit = {
         uiState.currentPass?.let { onAction(RadarAction.AddToCalendar(it.name, it.aosTime, it.losTime)) }
     }
-    // Station-B overlay: full track line (not time-limited) + live position dot
+    // Station-B overlay: full track line (only where B's elevation > 0) + live position dot
     // at the current moment, same display mode as the local station.
     val trackB = remember(mutualData.trackSamples) {
-        mutualData.trackSamples.map {
-            OrbitalPos(
-                azimuth = it.azimuthB * PI / 180.0,
-                elevation = it.elevationB * PI / 180.0,
-                time = it.time
-            )
-        }
+        mutualData.trackSamples
+            .filter { it.elevationB > 0.0 }
+            .map {
+                OrbitalPos(
+                    azimuth = it.azimuthB * PI / 180.0,
+                    elevation = it.elevationB * PI / 180.0,
+                    time = it.time
+                )
+            }
     }
     val timeNow = System.currentTimeMillis()
     val trackBPosition = mutualData.trackSamples
@@ -182,7 +184,7 @@ private fun PagerCard(
     modifier: Modifier = Modifier
 ) {
     val pages = RadarPage.entries
-    val pagerState = rememberPagerState(pageCount = { pages.size })
+    val pagerState = rememberPagerState(initialPage = 1, pageCount = { pages.size })
     val coroutineScope = rememberCoroutineScope()
 
     ElevatedCard(modifier = modifier) {