Harden backup paths and backup handling

pages.go

@@ -2,8 +2,8 @@ package main
 
 import (
 	"fmt"
+	"path/filepath"
 	"strings"
-	"time"
 
 	"github.com/charmbracelet/bubbles/list"
 	"github.com/charmbracelet/bubbles/progress"
@@ -72,7 +72,7 @@ func updateMainMenu(m model, msg tea.Msg) (model, tea.Cmd) {
 				return m, m.codeInput.Focus()
 			case 1:
 				m.currentPage = pageVersionSelect
-				m.logLines = nil // Bug2: 清除残留 logLines，否则版本列表被错误文本遮挡
+				m.logLines = nil            // Bug2: 清除残留 logLines，否则版本列表被错误文本遮挡
 				m.versionList.SetItems(nil) // Bug10: 清除旧列表，避免短暂显示过时数据
 				return m, scanVersions(m.exeDir)
 			}
@@ -155,7 +155,7 @@ func updateExecuting(m model, msg tea.Msg) (model, tea.Cmd) {
 			m.logLines = append(m.logLines, successStyle.Render("没有需要执行的操作"))
 			return m, nil
 		}
-		m.backupDir = fmt.Sprintf("amt/backup/%s", time.Now().Format("20060102_150405"))
+		m.backupDir = newBackupDir()
 		m.logLines = append(m.logLines, boldStyle.Render(fmt.Sprintf("共 %d 个操作", len(m.actions))))
 		m.logLines = append(m.logLines, describeAction(m.actions[0], 0, len(m.actions)))
 		return m, tea.Batch(m.spinner.Tick, executeAction(m.versionDir, m.actions[0], 0, m.backupDir))
@@ -200,6 +200,9 @@ func updateExecuting(m model, msg tea.Msg) (model, tea.Cmd) {
 		m.progressCh = nil
 		m.execErr = msg.err
 		m.logLines = append(m.logLines, fmt.Sprintf("%s [%d/%d] 失败: %s", crossMark, msg.index+1, len(m.actions), msg.err.Error()))
+		if m.backupDir != "" {
+			m.logLines = append(m.logLines, subtleStyle.Render("备份目录: "+filepath.Join(m.versionDir, m.backupDir)))
+		}
 		return m, nil
 
 	case mirrorChoiceMsg: