Feature: Show live transfer speed in file-transfer dialog title

Add a smoothed bytes-per-second readout to the CDlgFileSend title,
refreshed about every 200 ms during transfer (e.g. "发送文件 - 5.3M/s").
The base title is captured on the first progress frame and the speed
suffix applied through Unicode APIs (GetWindowTextW / SetWindowTextW),
so the whole title stays correct on non-Chinese systems where the ANSI
message path would misdecode GBK as the system ACP.

Also add the missing "接收文件 (V2)" translation (en_US "Receive File (V2)",
zh_TW "接收檔案 (V2)"), so the V2 receive title no longer falls back to
raw Chinese on non-Chinese systems.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/CDlgFileSend.cpp

@@ -151,6 +151,54 @@ void CDlgFileSend::UpdateProgress(CString file, const FileProgressInfo& info)
     PostMessageA(WM_UPDATEFILEPROGRESS, (WPARAM)new CString(file), (LPARAM)new FileProgressInfo(info));
 }
 
+// 将字节/秒格式化为人类可读的速度串（如 "5.3M/s"、"320K/s"、"800B/s"）
+static CStringW FormatSpeed(double bps)
+{
+    CStringW s;
+    if (bps >= 1024.0 * 1024.0)
+        s.Format(L"%.1fM/s", bps / (1024.0 * 1024.0));
+    else if (bps >= 1024.0)
+        s.Format(L"%.0fK/s", bps / 1024.0);
+    else
+        s.Format(L"%.0fB/s", bps);
+    return s;
+}
+
+// 累计字节并周期性刷新标题中的速度（如 "发送文件 - 5.3M/s"）
+void CDlgFileSend::UpdateTitleWithSpeed(uint64_t dataLength)
+{
+    m_ullTotalBytes += dataLength;
+    ULONGLONG now = GetTickCount64();
+
+    // 首帧：用 Unicode API 捕获当前标题作为基础部分（可能已被 V2/C2C 覆盖为 "接收文件 (V2)" 等），
+    // 并建立采样基准；此时尚无速度可显示。
+    if (!m_bBaseTitleCaptured) {
+        WCHAR wBase[128] = { 0 };
+        ::GetWindowTextW(m_hWnd, wBase, 128);
+        m_strBaseTitle = wBase;
+        m_bBaseTitleCaptured = true;
+        m_ullLastTick = now;
+        m_ullLastBytes = m_ullTotalBytes;
+        return;
+    }
+
+    ULONGLONG dt = now - m_ullLastTick;
+    if (dt < 200) return;  // 采样间隔未到，仅累积字节
+
+    uint64_t delta = m_ullTotalBytes - m_ullLastBytes;
+    double speed = dt ? (double)delta * 1000.0 / (double)dt : 0.0;
+    m_dSpeedBps = (m_dSpeedBps == 0.0) ? speed : m_dSpeedBps * 0.6 + speed * 0.4;  // 轻度平滑
+
+    m_ullLastTick = now;
+    m_ullLastBytes = m_ullTotalBytes;
+
+    // 基础标题（Unicode）+ ASCII 速度后缀，全程 Unicode API，避免非中文系统上 ANSI 消息按系统 ACP 解码乱码
+    CStringW title = m_strBaseTitle;
+    title += L" - ";
+    title += FormatSpeed(m_dSpeedBps);
+    ::SetWindowTextW(m_hWnd, title);
+}
+
 void CDlgFileSend::FinishFileSend(BOOL succeed)
 {
     if (!GetSafeHwnd()) return;
@@ -170,6 +218,7 @@ LRESULT CDlgFileSend::OnUpdateFileProgress(WPARAM wParam, LPARAM lParam)
     SetDlgItemText(IDC_STATIC_CURRENTINDEX, status);
     SetDlgItemText(IDC_STATIC_CURRENT_FILE, *pFile);
     m_Progress.SetPos((int)percent);
+    UpdateTitleWithSpeed(pInfo->dataLength);
 
     // 只在第一次显示时置顶，后续更新不抢焦点
     if (!IsWindowVisible()) {