refactor(HomeActivity): 修复内存泄漏并优化错误处理

1. 修复内存泄漏问题
   - 在 onDestroy 中清理所有 Handler 回调
   - 在 onDestroy 中释放 Dialog 引用

2. 增强类型安全
   - updateUI 中增加类型检查和日志
   - updateOverdueState 中增加完整的类型检查

3. 优化串口异常处理
   - 串口数据处理异常时向用户提示

4. 消除代码重复
   - 删除冗余的 saveShelfGoodsList 方法
   - 定时任务直接调用 syncShelfGoodsToServer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/main/java/com/shuwei/intelligent/shelves/activity/HomeActivity.kt

@@ -132,7 +132,11 @@ class HomeActivity : BaseActivity() {
                     // 切换到主线程协程处理串口数据
                     lifecycleScope.launch {
                         runCatching { receiveSerialPortData(data) }
-                            .onFailure { it.printStackTrace() }
+                            .onFailure {
+                                it.printStackTrace()
+                                log("串口数据处理异常: ${it.message}")
+                                toast("串口数据处理异常，请检查设备连接")
+                            }
                     }
                 }
             }
@@ -164,8 +168,21 @@ class HomeActivity : BaseActivity() {
                 launch {
                     viewModel.updateOverdueStateUiState.collect { state ->
                         if (state is UiState.Success<*>) {
-                            val respData = state.data as? com.shuwei.intelligent.shelves.net.RespData<*> ?: return@collect
-                            val items = (respData.data as? ShelfResult)?.containerGoodsList ?: return@collect
+                            val respData = state.data as? com.shuwei.intelligent.shelves.net.RespData<*>
+                            if (respData == null) {
+                                log("updateOverdueState: 数据类型错误，期望 RespData")
+                                return@collect
+                            }
+                            val shelfResult = respData.data as? ShelfResult
+                            if (shelfResult == null) {
+                                log("updateOverdueState: 数据类型错误，期望 ShelfResult")
+                                return@collect
+                            }
+                            val items = shelfResult.containerGoodsList
+                            if (items.isNullOrEmpty()) {
+                                log("updateOverdueState: 货架列表为空")
+                                return@collect
+                            }
                             applyOverdueState(items)
                         }
                     }
@@ -200,15 +217,17 @@ class HomeActivity : BaseActivity() {
     private fun updateUI(data: RespData<*>) {
         binding.include?.root?.gone()
         window?.decorView?.postDelayed({ Loading.dismiss() }, 500)
-        if (data.data !is ShelfResult) {
+        val shelfResult = data.data as? ShelfResult
+        if (shelfResult == null) {
+            log("updateUI: 数据类型错误，期望 ShelfResult，实际类型：${data.data?.javaClass?.simpleName}")
             loadEmptyView()
             return
         }
-        deviceName = data.data.deviceName
+        deviceName = shelfResult.deviceName
         updateLeftStatus(deviceName)
 
-        App.canteenId = data.data.placeId
-        val tempList = data.data.containerGoodsList
+        App.canteenId = shelfResult.placeId
+        val tempList = shelfResult.containerGoodsList
         if (tempList.isNullOrEmpty()) {
             loadEmptyView()
             return
@@ -276,6 +295,15 @@ class HomeActivity : BaseActivity() {
     }
 
     override fun onDestroy() {
+        // 清理 Handler 所有回调，防止内存泄漏
+        handler.removeCallbacksAndMessages(null)
+
+        // 关闭并释放 Dialog 引用，防止内存泄漏
+        tipDialog?.dismiss()
+        tipDialog = null
+        noDataWarningDialog?.dismiss()
+        noDataWarningDialog = null
+
         SerialPortManager.close()
         saveTaskJob?.cancel()
         overdueTaskJob?.cancel()
@@ -411,7 +439,7 @@ class HomeActivity : BaseActivity() {
      */
     private fun saveGoodsTask() {
         saveTaskJob = taskExecutor.startIntervalTaskWithInitialDelay(1 * 60 * 1000L, 5 * 60 * 1000L) {
-            saveShelfGoodsList()
+            syncShelfGoodsToServer()
         }
     }
 
@@ -449,6 +477,7 @@ class HomeActivity : BaseActivity() {
      * 构建 ShelfBody 并提交到服务端（被定时任务与 ShelfActivity 返回共用）
      */
     private fun syncShelfGoodsToServer() {
+        log("performSync: list:${list.toJsonString()}")
         val submitList = list.sortedBy { it.deviceNo }
         submitList.forEach {
             if (it.goodsId.isNullOrBlank()) {
@@ -465,9 +494,4 @@ class HomeActivity : BaseActivity() {
         log("performSync: body:${body.toJsonString()}")
         viewModel.saveShelfGoodsList(body)
     }
-
-    private fun saveShelfGoodsList() {
-        log("performSync: list:${list.toJsonString()}")
-        syncShelfGoodsToServer()
-    }
 }