feat(settings,ui): custom-source toggles default off; new UI Settings card; bump to 4.4.9

Two changes per user request:

1. Data source toggles default OFF with legacy-URL migration
   (continuation of the 4.4.8 fix, now also in the dialog): old
   example.com placeholder URLs are replaced by the real defaults and
   the custom toggles stay off, so the online update never points at a
   dead source after upgrading.

2. New "UI Settings" card between Other Settings and Credits:
   one switch per bottom-navigation page (卫星/过境/雷达/匹配/漫游/地图/设置
   in fixed order). Turning a page off removes it from the nav bar and
   the remaining items close up automatically; order is never
   rearranged. The Settings entry is always visible (switch disabled)
   so the user can never lose access to settings. Persisted via
   OtherSettings.hiddenScreens (StringSet of Screen.screenId; screenId
   added to the Screen sealed class - simpleName is unsafe under R8).

Version bump per fork convention: 4.4.8 -> 4.4.9, versionCode 449.
What's-new updated in en/zh/tr.

Verified: core:data + core:domain tests pass, all modules compile.

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

@@ -131,12 +131,13 @@ fun MainScreen(navigateToRadar: () -> Unit = {}) {
     val currentKey = backStack.lastOrNull()
     val navigateBack: () -> Unit = { backStack.removeLastOrNull() }
     val fadeTransition = fadeIn(animationSpec = tween(350)) togetherWith fadeOut(animationSpec = tween(350))
-    val navItems = listOf(Screen.Satellites, Screen.Passes, Screen.Radar, Screen.Mutual, Screen.Roaming, Screen.Map, Screen.Settings)
-
     val context = LocalContext.current
     val container = (context.applicationContext as IContainerProvider).getMainContainer()
     val trackingState by container.radioTrackingService.state.collectAsStateWithLifecycle()
     val otherSettings by container.settingsRepo.otherSettings.collectAsStateWithLifecycle()
+    // UI 设置: 按 hiddenScreens 过滤导航项(顺序固定, 关闭项自动靠拢; 设置页固定保留)
+    val navItems = listOf(Screen.Satellites, Screen.Passes, Screen.Radar, Screen.Mutual, Screen.Roaming, Screen.Map, Screen.Settings)
+        .filter { it.screenId !in otherSettings.hiddenScreens || it is Screen.Settings }
     // Activity-scoped so the mutual query results survive navigation to Radar and back
     val mutualViewModel: MutualViewModel = viewModel(
         viewModelStoreOwner = context as ViewModelStoreOwner,

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/SettingsRepo.kt

@@ -77,6 +77,7 @@ class SettingsRepo(
     private val keyStateOfUtc = "stateOfUtc"
     private val keyStateOfLightTheme = "stateOfLightTheme"
     private val keyStateOfNightMode = "stateOfNightMode"
+    private val keyHiddenScreens = "hiddenScreens"
     private val keyStationAltitude = "stationAltitude"
     private val keyStationLatitude = "stationLatitude"
     private val keyStationLongitude = "stationLongitude"
@@ -357,6 +358,7 @@ class SettingsRepo(
                 putString(keySstvMode, new.sstvMode)
                 putLong(keyLowElevation, new.lowElevation.toRawBits())
                 putLong(keyHighElevation, new.highElevation.toRawBits())
+                putStringSet(keyHiddenScreens, new.hiddenScreens.toSet())
             }
             new
         }
@@ -372,6 +374,7 @@ class SettingsRepo(
         shouldSeeWarning = preferences.getBoolean(keyShouldSeeWarning, true),
         shouldSeeWhatsNew = preferences.getBoolean(keyShouldSeeWhatsNew, true),
         sstvMode = preferences.getString(keySstvMode, null) ?: "Auto",
+        hiddenScreens = preferences.getStringSet(keyHiddenScreens, emptySet())?.toList() ?: emptyList(),
         lowElevation = Double.fromBits(preferences.getLong(keyLowElevation, 15.0.toRawBits())),
         highElevation = Double.fromBits(preferences.getLong(keyHighElevation, 45.0.toRawBits()))
     )

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/model/Settings.kt

@@ -62,7 +62,9 @@ data class OtherSettings(
     val shouldSeeWhatsNew: Boolean,
     val sstvMode: String = "Auto",
     val lowElevation: Double = 15.0,
-    val highElevation: Double = 45.0
+    val highElevation: Double = 45.0,
+    // UI 设置: 底部导航栏隐藏的页面(Screen simpleName 列表, 默认空 = 全部显示)
+    val hiddenScreens: List<String> = emptyList()
 )
 
 data class DataSourcesSettings(

core/presentation/src/main/java/com/rtbishop/look4sat/core/presentation/Navigation.kt

@@ -21,28 +21,28 @@ import androidx.navigation3.runtime.NavKey
 import kotlinx.serialization.Serializable
 
 @Serializable
-sealed class Screen(val iconResId: Int, val titleResId: Int) : NavKey {
+sealed class Screen(val iconResId: Int, val titleResId: Int, val screenId: String) : NavKey {
 
     @Serializable
-    data object Satellites : Screen(R.drawable.ic_satellites, R.string.nav_sat)
+    data object Satellites : Screen(R.drawable.ic_satellites, R.string.nav_sat, "Satellites")
 
     @Serializable
-    data object Passes : Screen(R.drawable.ic_passes, R.string.nav_pass)
+    data object Passes : Screen(R.drawable.ic_passes, R.string.nav_pass, "Passes")
 
     @Serializable
-    data object Radar : Screen(R.drawable.ic_radar, R.string.nav_radar)
+    data object Radar : Screen(R.drawable.ic_radar, R.string.nav_radar, "Radar")
 
     @Serializable
-    data object Map : Screen(R.drawable.ic_map, R.string.nav_map)
+    data object Map : Screen(R.drawable.ic_map, R.string.nav_map, "Map")
 
     @Serializable
-    data object Mutual : Screen(R.drawable.ic_match, R.string.nav_mutual)
+    data object Mutual : Screen(R.drawable.ic_match, R.string.nav_mutual, "Mutual")
 
     @Serializable
-    data object Roaming : Screen(R.drawable.ic_roaming, R.string.nav_roaming)
+    data object Roaming : Screen(R.drawable.ic_roaming, R.string.nav_roaming, "Roaming")
 
     @Serializable
-    data object Settings : Screen(R.drawable.ic_settings, R.string.nav_prefs)
+    data object Settings : Screen(R.drawable.ic_settings, R.string.nav_prefs, "Settings")
 }
 
 @Serializable

core/presentation/src/main/res/values-tr/strings.xml

@@ -57,6 +57,8 @@
         \n\n* Ayarlar: sıkışan anahtar satırları ve teşekkür aralığı düzeltildi
         \n\n* Uygulama adı artık Look4Sat Pro
         \n\n* Ayarlar: "İçe aktar" düğmesi "Özel URL" olarak yeniden adlandırıldı - TLE/alıcı-verici kaynak URL\'leri doğrudan düzenlenebilir
+        \n\n* Özel kaynak anahtarları varsayılan olarak KAPALI; eski örnek URL\'ler gerçek varsayılanlara sıfırlanır
+        \n\n* Yeni UI Ayarları kartı: alt gezinme sayfalarını göster/gizle (sıra sabit, Ayarlar her zaman görünür)
     </string>
 
     <!-- Radar screen -->
@@ -183,6 +185,7 @@
     <string name="prefs_net_perm_error">Ağ izninizi kontrol edin</string>
 
     <string name="prefs_other_title">Diğer ayarlar</string>
+    <string name="prefs_ui_title">UI Ayarları</string>
     <string name="prefs_other_switch_utc">Geçiş saatini UTC olarak göster</string>
     <string name="prefs_other_switch_update">Otomatik veri güncellemeyi etkinleştir</string>
     <string name="prefs_other_switch_sweep">Radar taramasını etkinleştir</string>

core/presentation/src/main/res/values-zh/strings.xml

@@ -47,6 +47,8 @@
         \n\n* 设置：修复开关行挤压与感谢列表间距
         \n\n* 应用名现为 Look4Sat Pro
         \n\n* 设置：导入文件按钮更名为自定义URL，可直接编辑 TLE/收发机数据源地址
+        \n\n* 自定义数据源开关默认关闭；旧版占位 URL 自动重置为真实默认地址
+        \n\n* 新增 UI设置 卡片：可显示/隐藏底部菜单栏页面（顺序固定，设置页始终显示）
     </string>
 
     <!-- Radar screen -->
@@ -166,6 +168,7 @@
     <string name="rc_enable_switch">启用 CAT 控制</string>
 
     <string name="prefs_other_title">其他设置</string>
+    <string name="prefs_ui_title">UI设置</string>
     <string name="prefs_other_switch_utc">以 UTC 时间显示</string>
     <string name="prefs_other_switch_update">启用卫星数据自动更新</string>
     <string name="prefs_other_switch_sweep">启用雷达扫描动画</string>

core/presentation/src/main/res/values/strings.xml

@@ -59,6 +59,8 @@
         \n\n* Settings: fixed squeezed toggle rows and credits spacing
         \n\n* App name is now Look4Sat Pro
         \n\n* Settings: "Import" button renamed to "Custom URL" - edit TLE/transceiver source URLs directly
+        \n\n* Custom source toggles default OFF; legacy placeholder URLs are reset to the real defaults
+        \n\n* New UI Settings card: show/hide bottom navigation pages (order fixed, Settings always visible)
     </string>
 
     <!-- Radar screen -->
@@ -197,6 +199,7 @@
     <string name="prefs_net_perm_error">Check your network permission</string>
 
     <string name="prefs_other_title">Other settings</string>
+    <string name="prefs_ui_title">UI Settings</string>
     <string name="prefs_other_switch_utc">Show pass time in UTC</string>
     <string name="prefs_other_switch_update">Enable automatic data update</string>
     <string name="prefs_other_switch_sweep">Enable radar sweep animation</string>

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsScreen.kt

@@ -300,6 +300,12 @@ private fun SettingsScreen(uiState: SettingsState, onAction: (SettingsAction) ->
                 )
             }
             item { OtherCard(uiState.otherSettings, onAction) }
+            item {
+                UiSettingsCard(
+                    hiddenScreens = uiState.otherSettings.hiddenScreens,
+                    onToggle = { name -> onAction(SettingsAction.ToggleScreen(name)) }
+                )
+            }
             item { CardCredits() }
         }
     }
@@ -516,8 +522,47 @@ private fun OtherCard(settings: OtherSettings, onAction: (SettingsAction) -> Uni
     }
 }
 
+/**
+ * UI 设置卡片: 控制底部菜单栏各页面显示/隐藏。
+ * 顺序固定(卫星/过境/雷达/匹配/漫游/地图/设置), 关闭后其余自动靠拢;
+ * "设置"页固定显示(防止失去设置入口)。
+ */
 @Composable
-private fun SwitchRow(labelResId: Int, checked: Boolean, onCheckedChange: (Boolean) -> Unit) {
+private fun UiSettingsCard(hiddenScreens: List<String>, onToggle: (String) -> Unit) {
+    val screens = listOf(
+        R.string.nav_sat to "Satellites",
+        R.string.nav_pass to "Passes",
+        R.string.nav_radar to "Radar",
+        R.string.nav_mutual to "Mutual",
+        R.string.nav_roaming to "Roaming",
+        R.string.nav_map to "Map",
+        R.string.nav_prefs to "Settings"
+    ) // name 必须与 Screen.screenId 一致 (R8 安全)
+    ElevatedCard(modifier = Modifier.fillMaxWidth()) {
+        Column(
+            modifier = Modifier.padding(horizontal = 8.dp, vertical = 4.dp),
+            verticalArrangement = Arrangement.spacedBy(4.dp)
+        ) {
+            Text(
+                text = stringResource(id = R.string.prefs_ui_title),
+                color = MaterialTheme.colorScheme.primary
+            )
+            screens.forEach { (labelRes, name) ->
+                if (name == "Settings") {
+                    // 设置页固定显示, 开关禁用
+                    SwitchRow(labelRes, true, null)
+                } else {
+                    SwitchRow(labelRes, name !in hiddenScreens) {
+                        onToggle(name)
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun SwitchRow(labelResId: Int, checked: Boolean, onCheckedChange: ((Boolean) -> Unit)?) {
     Row(
         horizontalArrangement = Arrangement.SpaceBetween,
         verticalAlignment = Alignment.CenterVertically,

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsState.kt

@@ -64,6 +64,8 @@ sealed interface SettingsAction {
     data class ToggleSensor(val value: Boolean) : SettingsAction
     data class ToggleLightTheme(val value: Boolean) : SettingsAction
     data class ToggleNightMode(val value: Boolean) : SettingsAction
+    // UI 设置: 切换底部导航栏页面的隐藏状态(Screen simpleName)
+    data class ToggleScreen(val screenName: String) : SettingsAction
 
     // Remote control
     data class UpdateRC(val settings: RCSettings) : SettingsAction

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsViewModel.kt

@@ -121,6 +121,11 @@ class SettingsViewModel(
             is SettingsAction.ToggleSensor -> settingsRepo.updateOtherSettings { it.copy(stateOfSensors = action.value) }
             is SettingsAction.ToggleLightTheme -> settingsRepo.updateOtherSettings { it.copy(stateOfLightTheme = action.value) }
             is SettingsAction.ToggleNightMode -> settingsRepo.updateOtherSettings { it.copy(stateOfNightMode = action.value) }
+            is SettingsAction.ToggleScreen -> settingsRepo.updateOtherSettings { current ->
+                val hidden = current.hiddenScreens.toMutableList()
+                if (action.screenName in hidden) hidden.remove(action.screenName) else hidden.add(action.screenName)
+                current.copy(hiddenScreens = hidden)
+            }
             // Remote control & data sources
             is SettingsAction.UpdateRC -> settingsRepo.updateRCSettings(action.settings)
             is SettingsAction.UpdateRadioControl -> settingsRepo.updateRadioControlSettings(action.settings)