feat(ui): top-right 日程按钮 — add current/next pass to system calendar on radar and passes pages

Restores the original repo's calendar function (ic_calendar → AddToCalendar via
CalendarContract ACTION_INSERT) to the top-right of both pages, replacing the
map buttons:
- Radar page: back to upstream's addToCalendar (current pass name/aos/los).
- Passes page: new PassesAction.AddToCalendar wired through PassesViewModel +
  container.provideAddToCalendar() (next pass name/aos/los); left button back
  to the pass filter (reverts the earlier radios-button swap).
The map button is gone from both top bars — the map is now a bottom-nav tab.
Also drops the now-dead openMapRequest/navigateToMap navigation chain in
NavRoot/MainScreen that only the radar map button used.

app/src/main/java/com/rtbishop/look4sat/MainScreen.kt

@@ -51,7 +51,6 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
@@ -94,16 +93,11 @@ import com.rtbishop.look4sat.feature.status.SatStatusDestination
 fun NavRoot(deeplink: String? = null) {
     val rootBackStack = rememberNavBackStack(Screen.Passes)
     val deeplinkResolver = DeeplinkResolver()
-    var openMapRequest by remember { mutableIntStateOf(0) }
     LaunchedEffect(deeplink) {
         deeplink?.let { rootBackStack.add(deeplinkResolver.resolve(it)) }
     }
     val navigateBack: () -> Unit = { rootBackStack.removeLastOrNull() }
     val navigateToRadar: () -> Unit = { rootBackStack.add(RadarDestination) }
-    val navigateToMap: () -> Unit = {
-        while (rootBackStack.size > 1) rootBackStack.removeAt(rootBackStack.size - 1)
-        openMapRequest += 1
-    }
     // Incoming screen slides in from the right, outgoing drifts left at 1/3 speed (API35+ style)
     val pushTransition = slideInHorizontally(tween(300)) { it } togetherWith
         slideOutHorizontally(tween(300)) { -it / 3 }
@@ -124,9 +118,7 @@ fun NavRoot(deeplink: String? = null) {
         entryProvider = entryProvider {
             entry<Screen.Passes> {
                 MainScreen(
-                    navigateToRadar = navigateToRadar,
-                    openMapRequest = openMapRequest,
-                    onOpenMapRequestHandled = { openMapRequest = 0 }
+                    navigateToRadar = navigateToRadar
                 )
             }
             entry<RadarDestination> {
@@ -134,7 +126,7 @@ fun NavRoot(deeplink: String? = null) {
                     modifier = Modifier.fillMaxSize(),
                     color = MaterialTheme.colorScheme.background
                 ) {
-                    RadarDestination(navigateUp = navigateBack, navigateToMap = navigateToMap)
+                    RadarDestination(navigateUp = navigateBack)
                 }
             }
         }
@@ -143,23 +135,11 @@ fun NavRoot(deeplink: String? = null) {
 
 @Composable
 fun MainScreen(
-    navigateToRadar: () -> Unit = {},
-    openMapRequest: Int = 0,
-    onOpenMapRequestHandled: () -> Unit = {}
+    navigateToRadar: () -> Unit = {}
 ) {
     val backStack = rememberNavBackStack(Screen.Passes)
     val currentKey = backStack.lastOrNull()
     val navigateBack: () -> Unit = { backStack.removeLastOrNull() }
-    val navigateToMap: () -> Unit = {
-        while (backStack.size > 1) backStack.removeAt(backStack.size - 1)
-        backStack.add(Screen.Map)
-    }
-    LaunchedEffect(openMapRequest) {
-        if (openMapRequest > 0) {
-            navigateToMap()
-            onOpenMapRequestHandled()
-        }
-    }
     val fadeTransition = fadeIn(animationSpec = tween(350)) togetherWith fadeOut(animationSpec = tween(350))
     // Map sits at position 4 from the left, matching the upstream nav order
     // (Satellites, Passes, AMSAT/Status, Map, ...), with the fork's Mutual tab

feature/passes/src/main/java/com/rtbishop/look4sat/feature/passes/PassesScreen.kt

@@ -156,7 +156,7 @@ private fun PassesScreen(
             TopBar(
                 isVerticalLayout = isVerticalLayout,
                 startAction = {
-                    IconCard(action = { onAction(PassesAction.ToggleRadiosDialog) }, resId = R.drawable.ic_radios)
+                    IconCard(action = { onAction(PassesAction.TogglePassesDialog) }, resId = R.drawable.ic_filter)
                 },
                 topInfo = {
                     TimerRow(timeString = uiState.nextTime, isTimeAos = uiState.isNextTimeAos)
@@ -165,7 +165,19 @@ private fun PassesScreen(
                     NextPassRow(pass = uiState.nextPass, isUtc = uiState.isUtc)
                 },
                 endAction = {
-                    IconCard(action = { onAction(PassesAction.TogglePassesDialog) }, resId = R.drawable.ic_filter)
+                    // 日程功能: 把下个过境写入系统日历 (原仓库雷达页的 addToCalendar).
+                    IconCard(
+                        action = {
+                            onAction(
+                                PassesAction.AddToCalendar(
+                                    uiState.nextPass.name,
+                                    uiState.nextPass.aosTime,
+                                    uiState.nextPass.losTime
+                                )
+                            )
+                        },
+                        resId = R.drawable.ic_calendar
+                    )
                 }
             )
         }

feature/passes/src/main/java/com/rtbishop/look4sat/feature/passes/PassesState.kt

@@ -61,4 +61,6 @@ sealed interface PassesAction {
     data object ToggleRadiosDialog : PassesAction
     data class FocusCatNum(val catNum: Int) : PassesAction
     data object ClearFocus : PassesAction
+    /** 日程功能: 把下个过境写入系统日历 (ic_calendar 按钮). */
+    data class AddToCalendar(val name: String, val aosTime: Long, val losTime: Long) : PassesAction
 }

feature/passes/src/main/java/com/rtbishop/look4sat/feature/passes/PassesViewModel.kt

@@ -28,6 +28,7 @@ import com.rtbishop.look4sat.core.domain.predict.OrbitalPass
 import com.rtbishop.look4sat.core.domain.repository.IMainContainer
 import com.rtbishop.look4sat.core.domain.repository.ISatelliteRepo
 import com.rtbishop.look4sat.core.domain.repository.ISettingsRepo
+import com.rtbishop.look4sat.core.domain.usecase.IAddToCalendar
 import com.rtbishop.look4sat.core.domain.utility.round
 import com.rtbishop.look4sat.core.domain.utility.toTimerString
 import com.rtbishop.look4sat.core.presentation.getDefaultPass
@@ -46,7 +47,8 @@ import java.util.TimeZone
 
 class PassesViewModel(
     private val satelliteRepo: ISatelliteRepo,
-    private val settingsRepo: ISettingsRepo
+    private val settingsRepo: ISettingsRepo,
+    private val addToCalendar: IAddToCalendar
 ) : ViewModel() {
 
     private val defaultPass = getDefaultPass()
@@ -151,6 +153,8 @@ class PassesViewModel(
                 _uiState.update { it.copy(isRadiosDialogShown = !it.isRadiosDialogShown) }
             is PassesAction.FocusCatNum -> _uiState.update { it.copy(focusedCatNum = action.catNum) }
             PassesAction.ClearFocus -> _uiState.update { it.copy(focusedCatNum = null) }
+            is PassesAction.AddToCalendar ->
+                addToCalendar(action.name, action.aosTime, action.losTime)
         }
     }
 
@@ -345,7 +349,8 @@ class PassesViewModel(
             initializer {
                 PassesViewModel(
                     satelliteRepo = container.satelliteRepo,
-                    settingsRepo = container.settingsRepo
+                    settingsRepo = container.settingsRepo,
+                    addToCalendar = container.provideAddToCalendar()
                 )
             }
         }

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

@@ -84,7 +84,7 @@ private enum class RadarPage(val title: String) {
 }
 
 @Composable
-fun RadarDestination(navigateUp: () -> Unit, navigateToMap: () -> Unit) {
+fun RadarDestination(navigateUp: () -> Unit) {
     val context = LocalContext.current
     val container = (context.applicationContext as IContainerProvider).getMainContainer()
     val viewModel: RadarViewModel = viewModel(factory = RadarViewModel.factory(container))
@@ -96,12 +96,6 @@ fun RadarDestination(navigateUp: () -> Unit, navigateToMap: () -> Unit) {
         }
         navigateUp()
     }
-    val navigateToMapAndClearMutual = {
-        if (container.mutualPassData.value.endTime > 0L) {
-            container.setMutualPassData(MutualPassData())
-        }
-        navigateToMap()
-    }
     LaunchedEffect(mutualData.endTime) {
         if (mutualData.endTime <= 0L) return@LaunchedEffect
         while (true) {
@@ -127,7 +121,7 @@ fun RadarDestination(navigateUp: () -> Unit, navigateToMap: () -> Unit) {
         viewModel.onAction(RadarAction.SstvPermissionResult(granted))
         viewModel.onAction(RadarAction.CwPermissionResult(granted))
     }
-    RadarScreen(uiState, viewModel::onAction, navigateUpAndClearMutual, navigateToMapAndClearMutual, mutualData, requestMicPermission = {
+    RadarScreen(uiState, viewModel::onAction, navigateUpAndClearMutual, mutualData, requestMicPermission = {
         permissionLauncher.launch(Manifest.permission.RECORD_AUDIO)
     })
 }
@@ -137,11 +131,14 @@ private fun RadarScreen(
     uiState: RadarState,
     onAction: (RadarAction) -> Unit,
     navigateUp: () -> Unit,
-    navigateToMap: () -> Unit,
     mutualData: MutualPassData,
     requestMicPermission: () -> Unit
 ) {
     val upcomingPass = uiState.currentPass ?: getDefaultPass()
+    // 日程功能: 把当前过境写入系统日历(原仓库的 addToCalendar, ic_calendar 按钮)
+    val addToCalendar: () -> Unit = {
+        uiState.currentPass?.let { onAction(RadarAction.AddToCalendar(it.name, it.aosTime, it.losTime)) }
+    }
     // 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) {
@@ -177,7 +174,7 @@ private fun RadarScreen(
             TopBar {
                 IconCard(action = navigateUp, resId = R.drawable.ic_back)
                 TimerRow(timeString = uiState.currentTime, isTimeAos = uiState.isTimeAos)
-                IconCard(action = navigateToMap, resId = R.drawable.ic_map)
+                IconCard(action = addToCalendar, resId = R.drawable.ic_calendar)
             }
             TopBar { NextPassRow(pass = upcomingPass, isUtc = uiState.isUtc) }
         } else {
@@ -185,7 +182,7 @@ private fun RadarScreen(
                 IconCard(action = navigateUp, resId = R.drawable.ic_back)
                 TimerRow(timeString = uiState.currentTime, isTimeAos = uiState.isTimeAos)
                 NextPassRow(pass = upcomingPass, modifier = Modifier.weight(1f), isUtc = uiState.isUtc)
-                IconCard(action = navigateToMap, resId = R.drawable.ic_map)
+                IconCard(action = addToCalendar, resId = R.drawable.ic_calendar)
             }
         }
         if (isVertical) {