feat(v2): T-309 no startup foreground grab, auto-close popup, rename buttons

- Comment out Gio's startup SetForegroundWindow/SetFocus in the vendored
  os_windows.go (marked SILVER-POSE PATCH; reverts on re-vendor) so the
  window no longer steals foreground on launch. Gio has no option for this.
- The fall confirm popup auto-closes 5s after opening (op.InvalidateCmd
  schedules the redraw even with no live frames); '我已知晓' still closes early.
- Rename save buttons to 保存摄像头参数 / 保存常用检测参数. Cross-compiles for Windows.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

progress.md

@@ -639,3 +639,12 @@
 - 验证：UI 用 `GOOS=windows CGO_ENABLED=0` 交叉编译；store(sqlite,cgo) 本地 `CGO_ENABLED=1` gcc 编译；窗口/弹窗/DB 目视需 Windows。
 - 决策：SQLite 用 cgo mattn（用户选，vendor 更小；V2 本就 cgo）。DB 只存内网 host/端口/通道，不存密码；DB 放 artifacts/ 下随 gitignore。先做 ①（取消置顶/抢前台）。
 - 下一步：定位并取消窗口置顶（Gio ViewEvent 拿 HWND + SetWindowPos NOTOPMOST/NOACTIVATE），交叉编译验证。
+
+## 【2026-07-23】T-309 A：取消抢前台 + 弹窗自动关 + 按钮改名
+
+- 状态：DOING
+- 变更：①**vendored patch**——注释掉 `v2/vendor/gioui.org/app/os_windows.go` 启动时的 `SetForegroundWindow`/`SetFocus`(带 `SILVER-POSE PATCH (T-309)` 标记),取消"启动抢前台"。**注意:Gio 无 API 可关此行为;重跑 `go mod vendor` 会还原此补丁,需按标记重打。** 窗口默认非置顶(TopMost=false),故不需另改置顶。②④ 保存按钮改名为"保存摄像头参数"/"保存常用检测参数"。⑤ 摔倒确认弹窗记录打开时间,`layout` 中超 5 秒自动清除,并用 `op.InvalidateCmd{At:}` 调度到期重绘(停流也能自动关);"我已知晓"仍可提前关。
+- 验证：`GOOS=windows CGO_ENABLED=0 go build -mod=vendor ./internal/ui/... ./cmd/ui-spike/...` 退出码 0(含 patched os_windows.go)；gofmt 干净。窗口不抢前台/弹窗自动关的实际行为需 Windows 目视。
+- 阻塞：③测试连接、⑥SQLite 未做。
+- 决策：抢前台只能靠 patch vendored Gio（无 API）；已加显著标记并在此记录，便于 re-vendor 后重打。
+- 下一步：③测试连接摄像头按钮+弹窗；⑥SQLite(mattn) 记录（config 保留 host/端口/通道 + internal/store + 接线）。

v2/internal/ui/window.go

@@ -115,6 +115,7 @@ type Window struct {
 	latestImage *image.RGBA
 	imageGen    uint64
 	pending     *alert.Record
+	pendingAt   time.Time
 	seenAlerts  map[string]struct{}
 	incoming    []galleryIncoming
 	seenEvents  map[string]struct{}
@@ -335,6 +336,7 @@ func (window *Window) PresentAlert(record alert.Record) {
 	window.seenAlerts[record.Event.EventID] = struct{}{}
 	queued := record
 	window.pending = &queued
+	window.pendingAt = time.Now()
 	window.mu.Unlock()
 	playAlertSound()
 	window.appWindow.Invalidate()
@@ -360,6 +362,7 @@ func (window *Window) layout(gtx layout.Context) layout.Dimensions {
 	frame := window.latestImage
 	gen := window.imageGen
 	pending := window.pending
+	pendingAt := window.pendingAt
 	incoming := window.incoming
 	running := window.running
 	window.incoming = nil
@@ -410,6 +413,17 @@ func (window *Window) layout(gtx layout.Context) layout.Dimensions {
 		window.mu.Unlock()
 		pending = nil
 	}
+	// The confirm popup auto-closes 5 seconds after it opens.
+	if pending != nil {
+		if time.Since(pendingAt) >= 5*time.Second {
+			window.mu.Lock()
+			window.pending = nil
+			window.mu.Unlock()
+			pending = nil
+		} else {
+			gtx.Execute(op.InvalidateCmd{At: pendingAt.Add(5 * time.Second)})
+		}
+	}
 
 	content := func(gtx layout.Context) layout.Dimensions {
 		return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
@@ -701,7 +715,7 @@ func (window *Window) layoutSettings(gtx layout.Context, model ViewModel) layout
 		window.editorRow("传输 (tcp/udp)", &window.editTransport),
 		window.editorRow("连接超时 (秒)", &window.editTimeout),
 		window.checkRow("低延迟", &window.lowLatency),
-		window.buttonRow(&window.saveCamera, "保存摄像头"),
+		window.buttonRow(&window.saveCamera, "保存摄像头参数"),
 	)
 	paramsCard := verticalRows(
 		window.heading("常用检测参数（下次启动生效）"),
@@ -711,7 +725,7 @@ func (window *Window) layoutSettings(gtx layout.Context, model ViewModel) layout
 		window.editorRow("模型置信度", &window.editModelConf),
 		window.checkRow("要求先快速下移", &window.requireRapid),
 		window.checkRow("要求膝踝清晰", &window.requireLower),
-		window.buttonRow(&window.saveParams, "保存参数"),
+		window.buttonRow(&window.saveParams, "保存常用检测参数"),
 		window.labelRow(window.settingsStatus),
 	)
 	depsCard := verticalRows(

v2/vendor/gioui.org/app/os_windows.go

@@ -112,8 +112,10 @@ func newWindow(win *callbacks, options []Option) {
 		defer winMap.Delete(w.hwnd)
 		w.Configure(options)
 		w.ProcessEvent(Win32ViewEvent{HWND: uintptr(w.hwnd)})
-		windows.SetForegroundWindow(w.hwnd)
+		// SILVER-POSE PATCH (T-309): do not steal foreground/focus on startup.
-		windows.SetFocus(w.hwnd)
+		// Re-applying `go mod vendor` reverts this; see progress.md.
+		// windows.SetForegroundWindow(w.hwnd)
+		// windows.SetFocus(w.hwnd)
 		// Since the window class for the cursor is null,
 		// set it here to show the cursor.
 		w.SetCursor(pointer.CursorDefault)