Added light theme option suitable for e-ink devices (#256)

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -61,8 +61,8 @@ fun MainTheme(isDarkTheme: Boolean = isSystemInDarkTheme(), content: @Composable
             SideEffect {
                 val window = (view.context as ComponentActivity).window
                 val insetsController = WindowCompat.getInsetsController(window, view)
-                insetsController.isAppearanceLightStatusBars = false
-                insetsController.isAppearanceLightNavigationBars = false
+                insetsController.isAppearanceLightStatusBars = !isDarkTheme
+                insetsController.isAppearanceLightNavigationBars = !isDarkTheme
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
                     window.isNavigationBarContrastEnforced = false
                 }

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

@@ -266,6 +266,7 @@
     <string name="prefs_other_switch_sweep">Radar sweep</string>
     <string name="prefs_other_switch_sensors">Use sensors</string>
     <string name="prefs_other_switch_night_mode">Night filter</string>
+    <string name="prefs_other_switch_light_theme">Light theme</string>
     <string name="prefs_other_compass_offset">Radar compass offset</string>
     <string name="prefs_other_compass_offset_elev">Radar compass offset (elev)</string>