fix(settings): RadioControlDialog 组合期间写状态

问题：Compose 运行时警告两次 'State write during composition' (split mode 重置 + baud rate 调整)。
根因：splitMode/baudRate 的条件写操作在组合 body 内直接执行 (if 块)。
修复：用 LaunchedEffect 隔离副作用，避免组合期间修改状态。
影响：消除运行时警告，避免潜在的组合跳帧或死循环。

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

@@ -36,6 +36,7 @@ import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -519,13 +520,17 @@ fun RadioControlDialog(
     val isSingleRadio = isIcom && splitMode.value
 
     // Reset split mode when switching away from IC-705
-    if (!isIcom && splitMode.value) splitMode.value = false
+    LaunchedEffect(isIcom) {
+        if (!isIcom && splitMode.value) splitMode.value = false
+    }
 
     val baudRates = if (isIcom) RadioControlSettings.BAUD_RATES_ICOM
                    else         RadioControlSettings.BAUD_RATES_YAESU
 
     // If current baud rate is not in the new list, default to the first available
-    if (baudRate.intValue !in baudRates) baudRate.intValue = baudRates.first()
+    LaunchedEffect(baudRates) {
+        if (baudRate.intValue !in baudRates) baudRate.intValue = baudRates.first()
+    }
 
     val pairedDevices: List<Pair<String, String>> = remember {
         buildList {