feat(roaming): faithful QTH定位器 port, live-update toggle, night-mode safe

Rework the Roaming page after user review. It is now a faithful port of the QTH定位器 location panel, not a loose re-skin:

UI (matching the reference layout):
- GPS status dot (real: green when a fresh fix exists, outline when stale/missing) + date + time header
- Lat/Lon rows with DMS and 5-decimal display, big 8-char locator centered below
- 3x3 grid of neighboring 4-char squares with the reference proportions: center column ~2.6x wider (21.4% : 56.2% : 21.4%) and center row the tallest (31.5% : 35.9% : 31.7%); red position marker now placed at the fractional position of the fix inside the center cell (was fixed center)
- No oversized GPS button: live updating is now a Settings toggle '漫游位置实时更新' (stateOfRoamingLive, default on) that drives periodic location refresh

Style & night-mode safety:
- All colors come from MaterialTheme.colorScheme (surfaceVariant/secondaryContainer/error) — no hardcoded cyan/blue from the original app. The red night filter (ColorMatrix keeping only the R channel) blanked the old hardcoded palette; theme colors survive it.
- Chinese nav label '漫游' added to values-zh (was missing, showing English 'Roaming')

Settings:
- OtherSettings.stateOfRoamingLive persisted (default true), toggle row in Other card, height adjusted

Verified: feature:roaming, feature:settings, app compile clean.

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

@@ -76,6 +76,7 @@ class SettingsRepo(
     private val keyStateOfUtc = "stateOfUtc"
     private val keyStateOfLightTheme = "stateOfLightTheme"
     private val keyStateOfNightMode = "stateOfNightMode"
+    private val keyStateOfRoamingLive = "stateOfRoamingLive"
     private val keyStationAltitude = "stationAltitude"
     private val keyStationLatitude = "stationLatitude"
     private val keyStationLongitude = "stationLongitude"
@@ -351,6 +352,7 @@ class SettingsRepo(
                 putBoolean(keyStateOfUtc, new.stateOfUtc)
                 putBoolean(keyStateOfLightTheme, new.stateOfLightTheme)
                 putBoolean(keyStateOfNightMode, new.stateOfNightMode)
+                putBoolean(keyStateOfRoamingLive, new.stateOfRoamingLive)
                 putBoolean(keyShouldSeeWarning, new.shouldSeeWarning)
                 putBoolean(keyShouldSeeWhatsNew, new.shouldSeeWhatsNew)
                 putString(keySstvMode, new.sstvMode)
@@ -368,6 +370,7 @@ class SettingsRepo(
         stateOfUtc = preferences.getBoolean(keyStateOfUtc, false),
         stateOfLightTheme = preferences.getBoolean(keyStateOfLightTheme, false),
         stateOfNightMode = preferences.getBoolean(keyStateOfNightMode, false),
+        stateOfRoamingLive = preferences.getBoolean(keyStateOfRoamingLive, true),
         shouldSeeWarning = preferences.getBoolean(keyShouldSeeWarning, true),
         shouldSeeWhatsNew = preferences.getBoolean(keyShouldSeeWhatsNew, true),
         sstvMode = preferences.getString(keySstvMode, null) ?: "Auto",

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

@@ -58,6 +58,7 @@ data class OtherSettings(
     val stateOfUtc: Boolean,
     val stateOfLightTheme: Boolean,
     val stateOfNightMode: Boolean = false,
+    val stateOfRoamingLive: Boolean = true,
     val shouldSeeWarning: Boolean,
     val shouldSeeWhatsNew: Boolean,
     val sstvMode: String = "Auto",

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

@@ -186,6 +186,7 @@
     <string name="prefs_other_switch_sweep">Radar taramasını etkinleştir</string>
     <string name="prefs_other_switch_sensors">Radar görünümünü döndürmek için sensörleri kullan</string>
     <string name="prefs_other_switch_night_mode">Kırmızı gece filtresini etkinleştir</string>
+    <string name="prefs_other_switch_roaming_live">Roaming konumunu canlı güncelle</string>
 
     <string name="prefs_highlight_title">Elevasyon vurgusu</string>
     <string name="prefs_highlight_low">Düşük &lt; %1$d°</string>

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

@@ -10,6 +10,7 @@
     <string name="nav_pass">过境</string>
     <string name="nav_radar">雷达</string>
     <string name="nav_mutual">匹配</string>
+    <string name="nav_roaming">漫游</string>
     <string name="nav_map">地图</string>
     <string name="nav_prefs">设置</string>
 
@@ -161,6 +162,7 @@
     <string name="prefs_other_switch_sweep">启用雷达扫描动画</string>
     <string name="prefs_other_switch_sensors">使用传感器旋转雷达视图</string>
     <string name="prefs_other_switch_night_mode">启用红色夜间模式</string>
+    <string name="prefs_other_switch_roaming_live">漫游位置实时更新</string>
 
     <string name="prefs_highlight_title">仰角高亮</string>
     <string name="prefs_highlight_low">低 &lt; %1$d°</string>

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

@@ -197,6 +197,7 @@
     <string name="prefs_other_switch_sweep">Enable radar sweep animation</string>
     <string name="prefs_other_switch_sensors">Use sensors to rotate radar view</string>
     <string name="prefs_other_switch_night_mode">Enable red night mode filter</string>
+    <string name="prefs_other_switch_roaming_live">Update Roaming position live</string>
 
     <string name="prefs_highlight_title">Elevation highlight</string>
     <string name="prefs_highlight_low">Low &lt; %1$d°</string>