fix(ui): 修复菜单布局的三个严重 bug

Bug #1: moveToMain 误驱逐页面
- 根因：每次调用 moveToMain 都执行驱逐逻辑，即使页面本来就在主菜单
- 场景：拖拽主菜单内部顺序 → SettingsViewModel 遍历新顺序逐个调 moveToMain
  → 每次都判断 main.size > 5 → 误驱逐最后一个页面
- 修复：只在真正从 More 移到主菜单时才驱逐（加 wasInMore 标志位）

Bug #2: onReorder 传 resolve 输出污染状态
- 根因：SettingsScreen 拖拽回调传的是 resolve 输出（mainItems/subItems）
  而不是持久化输入（screenOrder/subMenuOrder）
- 场景：拖拽主菜单 → onReorder 传 [Radar, ..., Settings]（完整列表）
  → Settings 被显式存入 screenOrder → 下次 resolve 当作用户手动放置 → 参与驱逐逻辑
- 修复：
  1. 拖拽主菜单时过滤掉 Settings（锁定页面用默认位置，不存持久化）
  2. 另一个菜单用输入的 screenOrder/subMenuOrder，不用 resolve 输出

Bug #3: onReorder More 菜单传错参数
- 根因：拖拽 More 菜单时传的是 mainItems（resolve 输出），不是 screenOrder
- 修复：改用输入的 screenOrder

影响：修复前，拖拽主菜单会丢页面，移页面到主菜单可能导致 Settings 消失

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/navigation/MenuLayout.kt

@@ -99,16 +99,20 @@ object MenuLayout {
         val current = resolve(allScreenIds, screenOrder, subMenuOrder, emptyList())
         val main = current.mainIds.toMutableList()
         val more = current.moreIds.toMutableList()
+        val wasInMore = screenId in more
         more.remove(screenId)
         if (screenId !in main) {
             val at = main.indexOf(SETTINGS_ID).let { if (it == -1) main.size else it }
             main.add(at, screenId)
         }
-        val movable = main.filter { it != SETTINGS_ID && it != screenId }
-        if (main.size > MAIN_SLOTS && movable.isNotEmpty()) {
-            val evicted = movable.last()
-            main.remove(evicted)
-            more.add(0, evicted)
+        // Only evict when we actually added a new page from More; internal reordering must not evict.
+        if (wasInMore) {
+            val movable = main.filter { it != SETTINGS_ID && it != screenId }
+            if (main.size > MAIN_SLOTS && movable.isNotEmpty()) {
+                val evicted = movable.last()
+                main.remove(evicted)
+                more.add(0, evicted)
+            }
         }
         return Assignment(screenOrder = main, subMenuOrder = more)
     }

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

@@ -863,7 +863,11 @@ private fun UiSettingsCard(
                     )
                     onUpdateMenu(moved.screenOrder, moved.subMenuOrder)
                 },
-                onReorder = { main -> onUpdateMenu(main, subItems) }
+                onReorder = { main -> 
+                    // Settings is locked last; exclude it so resolve continues to use its default position
+                    val userOrder = main.filter { it != "Settings" }
+                    onUpdateMenu(userOrder, subMenuOrder) 
+                }
             )
             // More-menu area (pages behind "More")
             Text(
@@ -883,7 +887,7 @@ private fun UiSettingsCard(
                     )
                     onUpdateMenu(moved.screenOrder, moved.subMenuOrder)
                 },
-                onReorder = { sub -> onUpdateMenu(mainItems, sub) }
+                onReorder = { sub -> onUpdateMenu(screenOrder, sub) }
             )
             TextButton(onClick = onResetOrder) {
                 Text(text = stringResource(id = R.string.prefs_ui_order_reset))