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.

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()
                 )
             }
         }