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.

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>