fix: Socket.IO连接超时和日志刷屏修复

- NetworkManager重写为两阶段连接策略：Phase1快速10秒轮询 + Phase2后台监控(最长2分钟)
- Phase2与Socket.IO内置重连机制协作而非对抗，超时后触发forceReconnect
- 所有魔法数字提取为companion object常量
- ScreenCaptureManager: Socket.IO不可用日志降频(首次+每50次打印)
- 连接恢复时打印跳过帧数统计
- MainActivity: 清理残留emoji符号

app/src/main/java/com/hikoncont/manager/ScreenCaptureManager.kt

@@ -1847,30 +1847,44 @@ class ScreenCaptureManager(private val service: AccessibilityRemoteService) {
         }
     }
     
+    // Socket unavailable log throttle counter
+    private var socketUnavailableLogCount = 0
+
     /**
-     * 处理单帧数据
+     * Process single frame data.
+     * Throttles "socket unavailable" log to avoid flooding logcat
+     * when connection is down but capture is still running.
      */
     private suspend fun processFrameData(frameData: ByteArray) {
         try {
             var success = false
-            
-            // 优先使用Socket.IO v4官方客户端发送屏幕数据
+
             val socketIOManager = service.getSocketIOManager()
             if (socketIOManager != null && socketIOManager.isConnected()) {
                 socketIOManager.sendScreenData(frameData)
-                Log.v(TAG, "Socket.IO v4发送帧数据: ${frameData.size} bytes")
+                Log.v(TAG, "Socket.IO sent frame: ${frameData.size} bytes")
                 success = true
+                // Reset throttle counter on success
+                if (socketUnavailableLogCount > 0) {
+                    Log.i(TAG, "Socket.IO connection restored, " +
+                        "skipped $socketUnavailableLogCount frames while disconnected")
+                    socketUnavailableLogCount = 0
+                }
             } else {
-                Log.w(TAG, "Socket.IO连接不可用，无法发送屏幕数据")
+                socketUnavailableLogCount++
+                // Log first occurrence, then every 50th to avoid flooding
+                if (socketUnavailableLogCount == 1 || socketUnavailableLogCount % 50 == 0) {
+                    Log.w(TAG, "Socket.IO unavailable, cannot send screen data " +
+                        "(count=$socketUnavailableLogCount)")
+                }
             }
-            
-            // 记录成功发送时间
+
             if (success) {
                 lastSuccessfulSendTime = System.currentTimeMillis()
             }
-            
+
         } catch (e: Exception) {
-            Log.e(TAG, "处理帧数据失败", e)
+            Log.e(TAG, "Process frame data failed", e)
         }
     }