feat(ui): Battle.Net 序列号/恢复码展示 + 热键复制确认

- dialog_bnet_info.go: 新增 Battle.Net 信息对话框，显示序列号
  和恢复码，支持一键复制恢复码
- row_menu: 新增 rowActionBnetInfo 动作，仅对 Battle.Net 条目可见
- 热键行为确认：autoType 已自动复制到剪贴板 + 键入前台窗口
- i18n: action_bnet_info / dialog_bnet_info_title / bnet_info_intro
  / hint_bnet_restore_code_secret 三语翻译

internal/ui/app.go

@@ -127,6 +127,7 @@ type appState struct {
 	renameDlg     *renameDialog
 	confirmDelDlg *confirmDeleteDialog
 	iconPickerDlg *iconPickerDialog
+	bnetInfoDlg   *bnetInfoDialog
 	rowTargetIdx  int
 
 	store   *store
@@ -497,7 +498,13 @@ func drawFrame(gtx layout.Context, th *material.Theme, st *appState, w *app.Wind
 		total := len(st.entries)
 		st.mu.Unlock()
 		st.rowTargetIdx = moreTargetIdx
-		st.rowMenu = newRowActionMenu(moreTargetIdx, total)
+		vendor := ""
+		st.mu.Lock()
+		if moreTargetIdx >= 0 && moreTargetIdx < len(st.entries) {
+			vendor = st.entries[moreTargetIdx].Auth.Name()
+		}
+		st.mu.Unlock()
+		st.rowMenu = newRowActionMenu(moreTargetIdx, total, vendor)
 	}
 
 	// First-run welcome dialog. Routed before all other dialogs so the
@@ -743,6 +750,14 @@ func drawFrame(gtx layout.Context, th *material.Theme, st *appState, w *app.Wind
 				}
 				st.mu.Unlock()
 				st.iconPickerDlg = newIconPickerDialog(current)
+			case rowActionBnetInfo:
+				st.mu.Lock()
+				if idx >= 0 && idx < len(st.entries) {
+					if bn, ok := st.entries[idx].Auth.(*authenticator.BattleNetAuthenticator); ok {
+						st.bnetInfoDlg = newBnetInfoDialog(bn)
+					}
+				}
+				st.mu.Unlock()
 			}
 			w.Invalidate()
 		} else {

internal/ui/dialog_bnet_info.go

@@ -0,0 +1,77 @@
+package ui
+
+import (
+	"gioui.org/layout"
+	"gioui.org/unit"
+	"gioui.org/widget"
+	"gioui.org/widget/material"
+
+	"git.wxccs.org/iceking2nd/winauth-go/internal/authenticator"
+	"git.wxccs.org/iceking2nd/winauth-go/internal/i18n"
+	"git.wxccs.org/iceking2nd/winauth-go/internal/win32"
+)
+
+// bnetInfoDialog shows the Battle.Net serial number and restore code.
+// The restore code can be copied to the clipboard.
+type bnetInfoDialog struct {
+	serial      string
+	restoreCode string
+	copyBtn     widget.Clickable
+	closeBtn    widget.Clickable
+	copied      bool
+}
+
+func newBnetInfoDialog(bn *authenticator.BattleNetAuthenticator) *bnetInfoDialog {
+	return &bnetInfoDialog{
+		serial:      bn.Serial,
+		restoreCode: bn.RestoreCode(),
+	}
+}
+
+func (d *bnetInfoDialog) Layout(
+	gtx layout.Context, th *material.Theme,
+	onClose func(),
+) layout.Dimensions {
+	if d.closeBtn.Clicked(gtx) {
+		onClose()
+		return layout.Dimensions{Size: gtx.Constraints.Max}
+	}
+	if d.copyBtn.Clicked(gtx) {
+		if err := win32.SetClipboardText(d.restoreCode); err == nil {
+			d.copied = true
+		}
+	}
+
+	body := func(gtx layout.Context) layout.Dimensions {
+		return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
+			layout.Rigid(material.Body2(th, i18n.T("bnet_info_intro")).Layout),
+			layout.Rigid(layout.Spacer{Height: unit.Dp(12)}.Layout),
+			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
+				return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
+					layout.Rigid(material.Body2(th, i18n.T("label_serial")+": ").Layout),
+					layout.Rigid(material.Body1(th, d.serial).Layout),
+				)
+			}),
+			layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.Layout),
+			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
+				return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
+					layout.Rigid(material.Body2(th, i18n.T("label_restore_code")+": ").Layout),
+					layout.Rigid(material.Body1(th, d.restoreCode).Layout),
+				)
+			}),
+			layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.Layout),
+			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
+				copyLabel := i18n.T("btn_copy")
+				if d.copied {
+					copyLabel = i18n.T("msg_copied")
+				}
+				return material.Button(th, &d.copyBtn, copyLabel).Layout(gtx)
+			}),
+			layout.Rigid(layout.Spacer{Height: unit.Dp(4)}.Layout),
+			layout.Rigid(material.Caption(th, i18n.T("hint_bnet_restore_code_secret")).Layout),
+		)
+	}
+
+	return modalCardCancel(gtx, th, i18n.T("dialog_bnet_info_title"),
+		i18n.T("btn_close"), &d.closeBtn, body)
+}

internal/ui/row_menu.go

@@ -19,6 +19,7 @@ const (
 	rowActionMoveUp
 	rowActionMoveDown
 	rowActionChangeIcon
+	rowActionBnetInfo
 )
 
 // rowActionMenu is the small popup opened by the ⋯ button on each entry
@@ -29,20 +30,23 @@ type rowActionMenu struct {
 	idx         int
 	canMoveUp   bool
 	canMoveDown bool
+	isBnet      bool
 
 	renameBtn     widget.Clickable
 	deleteBtn     widget.Clickable
 	moveUpBtn     widget.Clickable
 	moveDownBtn   widget.Clickable
 	changeIconBtn widget.Clickable
+	bnetInfoBtn   widget.Clickable
 	cancelBtn     widget.Clickable
 }
 
-func newRowActionMenu(idx, total int) *rowActionMenu {
+func newRowActionMenu(idx, total int, vendor string) *rowActionMenu {
 	return &rowActionMenu{
 		idx:         idx,
 		canMoveUp:   idx > 0,
 		canMoveDown: idx < total-1,
+		isBnet:      vendor == "battlenet",
 	}
 }
 
@@ -107,6 +111,7 @@ func (m *rowActionMenu) Layout(gtx layout.Context, th *material.Theme) layout.Di
 					row(&m.renameBtn, i18n.T("action_rename"), true),
 					row(&m.deleteBtn, i18n.T("action_delete"), true),
 					row(&m.changeIconBtn, i18n.T("action_change_icon"), true),
+					row(&m.bnetInfoBtn, i18n.T("action_bnet_info"), m.isBnet),
 					row(&m.moveUpBtn, i18n.T("action_move_up"), m.canMoveUp),
 					row(&m.moveDownBtn, i18n.T("action_move_down"), m.canMoveDown),
 					layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.Layout),