新增: 会话分叉功能，优化增量扫描缓存

- 会话分叉: 按 c 键从历史会话分叉，支持带方向提示 - 启动自动加载历史记录 - 增量扫描: 缓存内存化、目录 modTime 跳过、已删除条目裁剪 - 刷新按钮复用 onTabSwitch 单一入口
新增: 会话分叉功能，优化增量扫描缓存
2026-05-31 21:40:20 +08:00 · 2026-05-28 16:18:32 +08:00 · 2026-05-22 16:25:32 +08:00 · 2026-05-22 16:25:00 +08:00
10 changed files with 1479 additions and 1156 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,6 @@ Thumbs.db

 # Claude
 .claude/
+*.exe
+*.exe.old
+*~
--- a/internal/app.go
+++ b/internal/app.go
--- a/internal/history.go
+++ b/internal/history.go
@@ -30,6 +30,7 @@ type Session struct {
 	Completed   []string  // AI 提取的已完成项
 	Pending     []string  // AI 提取的待办项
 	FilePath    string    // JSONL 文件完整路径
+	ForkFrom    string    // 分叉来源 session ID（空表示非分叉）
 }

 // ProjectDir 按目录分组的会话集合
@@ -89,6 +90,7 @@ type HistoryState struct {
 	Loaded     bool
 	Scanning   bool
 	Favorites  map[string]bool
+	Cache      map[string]*cacheEntry // 内存缓存，避免重复 I/O
 }

 // IsHistoryTab 判断当前是否在 HISTORY Tab
@@ -100,36 +102,53 @@ func (m *Model) IsHistoryTab() bool {

 type ScanCompleteMsg struct {
 	Projects   []*ProjectDir
+	Cache      map[string]*cacheEntry // 更新后的缓存
 	UpdatedIDs map[string]bool        // modTime 变化的会话，需要重新生成摘要
 }

 func ScanSessionsCmd() tea.Cmd {
 	return func() tea.Msg {
-		projects, updated := scanAllProjects()
-		return ScanCompleteMsg{Projects: projects, UpdatedIDs: updated}
+		projects, cache, updated := scanAllProjects()
+		return ScanCompleteMsg{Projects: projects, Cache: cache, UpdatedIDs: updated}
 	}
 }

-func scanAllProjects() ([]*ProjectDir, map[string]bool) {
+func scanAllProjects() ([]*ProjectDir, map[string]*cacheEntry, map[string]bool) {
 	home, err := os.UserHomeDir()
 	if err != nil {
-		return nil, nil
+		return nil, nil, nil
 	}
 	projectsDir := filepath.Join(home, ".claude", "projects")
 	entries, err := os.ReadDir(projectsDir)
 	if err != nil {
-		return nil, nil
+		return nil, nil, nil
 	}

-	cache := loadCache(home)
+	cache, projTimes := loadCacheWithTimes(home)
 	dirMap := make(map[string]*ProjectDir)
 	updatedIDs := make(map[string]bool)
+	seenIDs := make(map[string]bool)

 	for _, entry := range entries {
 		if !entry.IsDir() {
 			continue
 		}
 		projectPath := filepath.Join(projectsDir, entry.Name())
+		info, err := entry.Info()
+		if err != nil {
+			continue
+		}
+
+		// 项目目录 modTime 未变 → 从缓存直接重建该目录下的会话
+		if prev, ok := projTimes[projectPath]; ok && prev.Equal(info.ModTime()) {
+			for _, id := range rebuildFromCache(cache, dirMap, projectPath) {
+				seenIDs[id] = true
+			}
+			continue
+		}
+		// 目录有变更，记录新 modTime
+		projTimes[projectPath] = info.ModTime()
+
 		files, err := os.ReadDir(projectPath)
 		if err != nil {
 			continue
@@ -139,13 +158,14 @@ func scanAllProjects() ([]*ProjectDir, map[string]bool) {
 				continue
 			}
 			sessionID := strings.TrimSuffix(f.Name(), ".jsonl")
+			seenIDs[sessionID] = true
 			filePath := filepath.Join(projectPath, f.Name())
-			info, err := f.Info()
+			finfo, err := f.Info()
 			if err != nil {
 				continue
 			}

-			if cached, ok := cache[sessionID]; ok && cached.ModTime.Equal(info.ModTime()) {
+			if cached, ok := cache[sessionID]; ok && cached.ModTime.Equal(finfo.ModTime()) {
 				addSessionToDir(dirMap, cached.ToSession(sessionID))
 				continue
 			}
@@ -160,11 +180,31 @@ func scanAllProjects() ([]*ProjectDir, map[string]bool) {
 			session.Pending = nil
 			updatedIDs[sessionID] = true
 			addSessionToDir(dirMap, session)
-			cache[sessionID] = cacheEntryFrom(session, info.ModTime())
+			cache[sessionID] = cacheEntryFrom(session, finfo.ModTime())
 		}
 	}

-	saveCache(home, cache)
+	// 裁剪缓存：删除磁盘已不存在的条目
+	for id := range cache {
+		if !seenIDs[id] {
+			delete(cache, id)
+		}
+	}
+
+	// 清理已不存在项目的 projTimes
+	activeProjects := make(map[string]bool, len(entries))
+	for _, e := range entries {
+		if e.IsDir() {
+			activeProjects[filepath.Join(projectsDir, e.Name())] = true
+		}
+	}
+	for p := range projTimes {
+		if !activeProjects[p] {
+			delete(projTimes, p)
+		}
+	}
+
+	saveCacheWithTimes(home, cache, projTimes)

 	result := make([]*ProjectDir, 0, len(dirMap))
 	for _, pd := range dirMap {
@@ -176,7 +216,20 @@ func scanAllProjects() ([]*ProjectDir, map[string]bool) {
 	sort.Slice(result, func(i, j int) bool {
 		return result[i].Dir < result[j].Dir
 	})
-	return result, updatedIDs
+	return result, cache, updatedIDs
+}
+
+// rebuildFromCache 从缓存重建指定项目目录下的所有会话，返回匹配的 session ID
+func rebuildFromCache(cache map[string]*cacheEntry, dirMap map[string]*ProjectDir, projectPath string) []string {
+	prefix := filepath.Base(projectPath)
+	var seen []string
+	for id, e := range cache {
+		if filepath.Base(filepath.Dir(e.FilePath)) == prefix {
+			addSessionToDir(dirMap, e.ToSession(id))
+			seen = append(seen, id)
+		}
+	}
+	return seen
 }

 func addSessionToDir(dirMap map[string]*ProjectDir, s *Session) {
@@ -362,6 +415,7 @@ const cacheVersion = 2
 type cacheFile struct {
 	Version      int                      `json:"version"`
 	Sessions     map[string]*cacheEntry   `json:"sessions"`
+	ProjectTimes map[string]time.Time     `json:"projectTimes"` // 项目目录 modTime
 }

 type cacheEntry struct {
@@ -377,6 +431,7 @@ type cacheEntry struct {
 	Completed   []string  `json:"completed"`
 	Pending     []string  `json:"pending"`
 	FilePath    string    `json:"filePath"`
+	ForkFrom    string    `json:"forkFrom"`
 }

 func (e *cacheEntry) ToSession(id string) *Session {
@@ -386,7 +441,7 @@ func (e *cacheEntry) ToSession(id string) *Session {
 		MsgCount: e.MsgCount, FirstMsg: e.FirstMsg,
 		AwaySummary: e.AwaySummary, AISummary: e.AISummary,
 		Completed: e.Completed, Pending: e.Pending,
-		FilePath: e.FilePath,
+		FilePath: e.FilePath, ForkFrom: e.ForkFrom,
 	}
 }

@@ -397,7 +452,7 @@ func cacheEntryFrom(s *Session, modTime time.Time) *cacheEntry {
 		MsgCount: s.MsgCount, FirstMsg: s.FirstMsg,
 		AwaySummary: s.AwaySummary, AISummary: s.AISummary,
 		Completed: s.Completed, Pending: s.Pending,
-		FilePath: s.FilePath,
+		FilePath: s.FilePath, ForkFrom: s.ForkFrom,
 	}
 }

@@ -406,19 +461,32 @@ func cachePath(home string) string {
 }

 func loadCache(home string) map[string]*cacheEntry {
+	c, _ := loadCacheWithTimes(home)
+	return c
+}
+
+func loadCacheWithTimes(home string) (map[string]*cacheEntry, map[string]time.Time) {
 	data, err := os.ReadFile(cachePath(home))
 	if err != nil {
-		return make(map[string]*cacheEntry)
+		return make(map[string]*cacheEntry), make(map[string]time.Time)
 	}
 	var cf cacheFile
 	if json.Unmarshal(data, &cf) != nil || cf.Version != cacheVersion {
-		return make(map[string]*cacheEntry)
+		return make(map[string]*cacheEntry), make(map[string]time.Time)
 	}
-	return cf.Sessions
+	projTimes := cf.ProjectTimes
+	if projTimes == nil {
+		projTimes = make(map[string]time.Time)
+	}
+	return cf.Sessions, projTimes
 }

 func saveCache(home string, m map[string]*cacheEntry) {
-	cf := cacheFile{Version: cacheVersion, Sessions: m}
+	saveCacheWithTimes(home, m, nil)
+}
+
+func saveCacheWithTimes(home string, m map[string]*cacheEntry, projTimes map[string]time.Time) {
+	cf := cacheFile{Version: cacheVersion, Sessions: m, ProjectTimes: projTimes}
 	data, err := json.Marshal(cf)
 	if err != nil {
 		return
@@ -536,12 +604,10 @@ func extractMessagesForSummary(path string) string {
 	return strings.Join(msgs, "\n")
 }

-func saveSummaryToCache(sessionID, summary string, completed, pending []string) {
-	home, err := os.UserHomeDir()
-	if err != nil {
+func updateSummaryInCache(cache map[string]*cacheEntry, sessionID, summary string, completed, pending []string) {
+	if cache == nil {
 		return
 	}
-	cache := loadCache(home)
 	entry, ok := cache[sessionID]
 	if !ok {
 		return
@@ -549,6 +615,11 @@ func saveSummaryToCache(sessionID, summary string, completed, pending []string)
 	entry.AISummary = summary
 	entry.Completed = completed
 	entry.Pending = pending
+	// 异步持久化
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return
+	}
 	saveCache(home, cache)
 }

@@ -624,3 +695,89 @@ func collectFavorites(projects []*ProjectDir, favs map[string]bool) []*Session {
 	}
 	return out
 }
+
+// --- Fork 记录 ---
+
+func forksPath(home string) string {
+	return filepath.Join(home, ".u-tabs", "forks.json")
+}
+
+func loadForks() map[string]string {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return make(map[string]string)
+	}
+	data, err := os.ReadFile(forksPath(home))
+	if err != nil {
+		return make(map[string]string)
+	}
+	var m map[string]string
+	if json.Unmarshal(data, &m) != nil {
+		return make(map[string]string)
+	}
+	return m
+}
+
+func recordFork(targetID, sourceID string) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return
+	}
+	forks := loadForks()
+	forks[targetID] = sourceID
+	data, err := json.Marshal(forks)
+	if err != nil {
+		return
+	}
+	dir := filepath.Join(home, ".u-tabs")
+	os.MkdirAll(dir, 0o755)
+	os.WriteFile(forksPath(home), data, 0o644)
+}
+
+// --- AI 摘要与收藏操作 ---
+
+func (m *Model) applySummary(sessionID, summary string, completed, pending []string) {
+	if summary == "" {
+		return
+	}
+	for _, pd := range m.history.Projects {
+		for _, s := range pd.Sessions {
+			if s.ID == sessionID {
+				s.AISummary = summary
+				s.Completed = completed
+				s.Pending = pending
+				updateSummaryInCache(m.history.Cache, sessionID, summary, completed, pending)
+				return
+			}
+		}
+	}
+}
+
+func (m *Model) nextSummaryCmd() tea.Cmd {
+	for _, pd := range m.history.Projects {
+		for _, s := range pd.Sessions {
+			needSummary := s.AISummary == "" && s.FirstMsg != ""
+			needDetail := s.AISummary != "" && len(s.Completed) == 0 && len(s.Pending) == 0
+			if (needSummary || needDetail) && s.FilePath != "" {
+				return generateSummaryCmd(s.FilePath, s.ID)
+			}
+		}
+	}
+	return nil
+}
+
+func (m *Model) toggleFavorite() {
+	if m.history.Favorites == nil {
+		m.history.Favorites = loadFavorites()
+	}
+	s := m.currentSession()
+	if s == nil {
+		return
+	}
+	if m.history.Favorites[s.ID] {
+		delete(m.history.Favorites, s.ID)
+	} else {
+		m.history.Favorites[s.ID] = true
+	}
+	saveFavorites(m.history.Favorites)
+}
--- a/internal/key.go
+++ b/internal/key.go
@@ -0,0 +1,287 @@
+package internal
+
+import (
+	"charm.land/bubbletea/v2"
+)
+
+// --- 按键分发 ---
+
+func (m *Model) handleKey(s string) (*Model, tea.Cmd) {
+	switch s {
+	case "q", "ctrl+c":
+		return m, tea.Quit
+	case "u":
+		if m.update.Available && !m.update.Updating {
+			m.update.Updating = true
+			return m, SelfUpdateCmd(m.update.DownloadURL, m.update.SHA256, m.update.NewVersion)
+		}
+	}
+
+	// Tab 快捷切换: 1=工作空间 2=历史对话
+	if s == "1" {
+		if m.IsHistoryTab() {
+			m.activeGroup = 0
+			m.resetCursor()
+			m.wsFocus = 1
+		}
+		return m, nil
+	}
+	if s == "2" {
+		if !m.IsHistoryTab() {
+			m.activeGroup = len(Groups) // HISTORY
+			m.resetCursor()
+			m.wsFocus = 1
+			return m, m.onTabSwitch()
+		}
+		return m, nil
+	}
+
+	if m.IsHistoryTab() {
+		return m.handleHistoryKey(s)
+	}
+	return m.handleWorkspaceKey(s)
+}
+
+func (m *Model) onTabSwitch() tea.Cmd {
+	if !m.IsHistoryTab() || m.history.Scanning {
+		return nil
+	}
+	m.history.Scanning = true
+	return ScanSessionsCmd()
+}
+
+// --- Workspace 按键 ---
+
+func (m *Model) handleWorkspaceKey(s string) (*Model, tea.Cmd) {
+	switch s {
+	case "left", "h":
+		if m.wsFocus > 0 {
+			m.wsFocus = 0
+		}
+	case "right", "l":
+		if m.wsFocus < 1 {
+			m.wsFocus = 1
+		}
+	case "tab", "shift+tab":
+		m.wsFocus = (m.wsFocus + 1) % 2
+	case "up", "k":
+		if m.wsFocus == 0 {
+			m.moveGroupCursor(-1)
+		} else {
+			m.moveCursor(-1)
+		}
+	case "down", "j":
+		if m.wsFocus == 0 {
+			m.moveGroupCursor(1)
+		} else {
+			m.moveCursor(1)
+		}
+	case "enter":
+		if m.inputBuf != "" {
+			return m.launchByInput()
+		}
+		if m.wsFocus == 0 {
+			if m.wsTabCur >= len(Groups) {
+				m.activeGroup = len(Groups)
+				m.resetCursor()
+				return m, m.onTabSwitch()
+			}
+			m.activeGroup = m.wsTabCur
+			m.wsFocus = 1
+		} else {
+			return m.launchSelected()
+		}
+	default:
+		if len(s) == 1 && s[0] >= '0' && s[0] <= '9' {
+			m.inputBuf += s
+		}
+	}
+	return m, nil
+}
+
+func (m *Model) resetCursor() {
+	m.cursor = 0
+	m.inputBuf = ""
+}
+
+func (m *Model) moveGroupCursor(dir int) {
+	total := len(Groups) + 1 // 含历史入口
+	m.wsTabCur = (m.wsTabCur + dir + total) % total
+	if m.wsTabCur < len(Groups) {
+		m.activeGroup = m.wsTabCur
+	}
+	m.resetCursor()
+}
+
+// --- HISTORY 按键 ---
+
+func (m *Model) handleHistoryKey(s string) (*Model, tea.Cmd) {
+	if m.forkMode {
+		return m.handleForkInput(s)
+	}
+
+	switch s {
+	case "up", "k":
+		if m.history.FocusPanel == 0 {
+			m.moveHistoryDir(-1)
+		} else {
+			m.moveHistorySess(-1)
+		}
+	case "down", "j":
+		if m.history.FocusPanel == 0 {
+			m.moveHistoryDir(1)
+		} else {
+			m.moveHistorySess(1)
+		}
+	case "tab", "right", "l":
+		if m.history.FocusPanel < 1 {
+			m.history.FocusPanel = 1
+		}
+	case "shift+tab", "left", "h":
+		if m.history.FocusPanel > 0 {
+			m.history.FocusPanel = 0
+		}
+	case "enter":
+		if m.history.FocusPanel == 0 {
+			if m.history.DirCursor == len(m.history.Projects)+2 {
+				m.activeGroup = 0
+				m.resetCursor()
+				m.wsTabCur = 0
+				m.wsFocus = 1
+			}
+			m.history.FocusPanel = 1
+		} else {
+			return m.resumeSelected()
+		}
+	case "n":
+		return m.newSessionFromHistory()
+	case "r", "f5":
+		if cmd := m.onTabSwitch(); cmd != nil {
+			return m, cmd
+		}
+	case "f":
+		m.toggleFavorite()
+	case "c":
+		if m.currentSession() != nil && m.history.FocusPanel == 1 {
+			m.forkMode = true
+			m.forkBuf = ""
+		}
+	}
+	return m, nil
+}
+
+func (m *Model) handleForkInput(s string) (*Model, tea.Cmd) {
+	switch s {
+	case "enter":
+		return m.executeFork()
+	case "esc":
+		m.forkMode = false
+		m.forkBuf = ""
+	case "backspace":
+		if len(m.forkBuf) > 0 {
+			m.forkBuf = m.forkBuf[:len(m.forkBuf)-1]
+		}
+	default:
+		if len(s) == 1 && s[0] >= 32 && s[0] < 127 {
+			m.forkBuf += s
+		}
+	}
+	return m, nil
+}
+
+// --- 光标移动 ---
+
+func (m *Model) moveHistoryDir(dir int) {
+	if len(m.history.Projects) == 0 {
+		return
+	}
+	m.history.DirCursor += dir
+	maxDir := len(m.history.Projects) + 3
+	if m.history.DirCursor < 0 {
+		m.history.DirCursor = maxDir - 1
+	}
+	if m.history.DirCursor >= maxDir {
+		m.history.DirCursor = 0
+	}
+	m.history.SessCursor = 0
+}
+
+func (m *Model) moveHistorySess(dir int) {
+	sessions := m.currentSessions()
+	if len(sessions) == 0 {
+		return
+	}
+	m.history.SessCursor += dir
+	if m.history.SessCursor < 0 {
+		m.history.SessCursor = len(sessions) - 1
+	}
+	if m.history.SessCursor >= len(sessions) {
+		m.history.SessCursor = 0
+	}
+}
+
+func (m *Model) currentSessions() []*Session {
+	if m.history.DirCursor == 0 {
+		var all []*Session
+		for _, pd := range m.history.Projects {
+			all = append(all, pd.Sessions...)
+		}
+		return all
+	}
+	if m.history.DirCursor == 1 {
+		return collectFavorites(m.history.Projects, m.history.Favorites)
+	}
+	idx := m.history.DirCursor - 2
+	if idx >= len(m.history.Projects) {
+		return nil
+	}
+	return m.history.Projects[idx].Sessions
+}
+
+func (m *Model) currentSession() *Session {
+	sessions := m.currentSessions()
+	if len(sessions) == 0 {
+		return nil
+	}
+	if m.history.SessCursor >= len(sessions) {
+		m.history.SessCursor = len(sessions) - 1
+	}
+	return sessions[m.history.SessCursor]
+}
+
+func (m *Model) currentDirCwd() string {
+	if m.history.DirCursor <= 1 {
+		return ""
+	}
+	idx := m.history.DirCursor - 2
+	if idx >= len(m.history.Projects) {
+		return ""
+	}
+	return m.history.Projects[idx].Dir
+}
+
+func (m *Model) moveCursor(dir int) {
+	svcs := WorkspacesByGroup(Groups[m.activeGroup].Label)
+	if len(svcs) == 0 {
+		return
+	}
+	m.cursor += dir
+	if m.cursor < 0 {
+		m.cursor = len(svcs) - 1
+	}
+	if m.cursor >= len(svcs) {
+		m.cursor = 0
+	}
+}
+
+func (m *Model) toggleMultiSelect() {
+	svcs := WorkspacesByGroup(Groups[m.activeGroup].Label)
+	if m.cursor < len(svcs) {
+		idx := svcs[m.cursor].Index
+		if m.selected[idx] {
+			delete(m.selected, idx)
+		} else {
+			m.selected[idx] = true
+		}
+	}
+}
--- a/internal/launch.go
+++ b/internal/launch.go
@@ -0,0 +1,250 @@
+package internal
+
+import (
+	"fmt"
+	"log"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"charm.land/bubbletea/v2"
+)
+
+// SessionAction 描述一个 Claude Code 会话启动动作
+type SessionAction struct {
+	Cwd       string // 工作目录
+	Title     string // 窗口标题
+	SessionID string // resume/fork 目标（空=新建）
+	Fork      bool   // 是否分叉
+	Prompt    string // 初始提示（fork 方向或 workspace prompt）
+	Name      string // --name 参数（workspace 启动用）
+}
+
+// Execute 执行启动动作
+func (a SessionAction) Execute(m *Model) {
+	if isWindows {
+		cwd := toWinPath(a.Cwd)
+		launchInWtWithTitle(cwd, a.Title, a.buildScript())
+	} else {
+		m.pendingCmd = a.buildScript()
+	}
+}
+
+// buildScript 根据平台构建启动脚本
+func (a SessionAction) buildScript() string {
+	if isWindows {
+		return a.pwshScript()
+	}
+	return a.bashScript()
+}
+
+func (a SessionAction) pwshScript() string {
+	var b strings.Builder
+	b.WriteString(fmt.Sprintf(`$Host.UI.RawUI.WindowTitle = "%s"`, a.Title))
+	b.WriteString(fmt.Sprintf("\n\t\tWrite-Host \"=== %s ===\" -ForegroundColor Cyan", a.Title))
+
+	if a.Prompt != "" && a.Name == "" {
+		// workspace prompt 显示
+		b.WriteString(fmt.Sprintf("\n\t\tWrite-Host \"Prompt: %s\" -ForegroundColor Yellow", a.Prompt))
+	}
+
+	b.WriteString(fmt.Sprintf("\n\t\tcd \"%s\"", toWinPath(a.Cwd)))
+	b.WriteString("\n\t\tclaude")
+
+	if a.SessionID != "" {
+		b.WriteString(fmt.Sprintf(" -r %s", a.SessionID))
+		if a.Fork {
+			b.WriteString(" --fork-session")
+		}
+	}
+	if a.Prompt != "" && a.SessionID != "" {
+		escaped := strings.ReplaceAll(a.Prompt, `"`, "`\"")
+		b.WriteString(fmt.Sprintf(` "%s"`, escaped))
+	}
+	if a.Name != "" {
+		b.WriteString(fmt.Sprintf(` --name "%s"`, a.Name))
+	}
+	b.WriteString(" --permission-mode bypassPermissions")
+	return b.String()
+}
+
+func (a SessionAction) bashScript() string {
+	var b strings.Builder
+	b.WriteString(fmt.Sprintf(`printf '\033]0;%s\007' && echo "=== %s ==="`, a.Title, a.Title))
+
+	if a.Prompt != "" && a.Name == "" {
+		b.WriteString(fmt.Sprintf(` && echo "Prompt: %s"`, a.Prompt))
+	}
+
+	b.WriteString(fmt.Sprintf(` && cd "%s"`, a.Cwd))
+	b.WriteString(" && claude")
+
+	if a.SessionID != "" {
+		b.WriteString(fmt.Sprintf(" -r %s", a.SessionID))
+		if a.Fork {
+			b.WriteString(" --fork-session")
+		}
+	}
+	if a.Prompt != "" && a.SessionID != "" {
+		escaped := strings.ReplaceAll(a.Prompt, "'", "'\\''")
+		b.WriteString(fmt.Sprintf(` '%s'`, escaped))
+	}
+	if a.Name != "" {
+		b.WriteString(fmt.Sprintf(` --name "%s"`, a.Name))
+	}
+	b.WriteString(" --permission-mode bypassPermissions")
+	return b.String()
+}
+
+// --- 启动辅助 ---
+
+func launchInWtWithTitle(dir, tabTitle, script string) {
+	encoded := encodePSCommand(script)
+	color := fmt.Sprintf("#%02X%02X%02X", randRange(80, 255), randRange(80, 255), randRange(80, 255))
+	args := []string{"-w", "0", "-d", dir, "--tabColor", color}
+	if tabTitle != "" {
+		args = append(args, "--title", tabTitle)
+	}
+	args = append(args, "pwsh", "-NoExit", "-EncodedCommand", encoded)
+	cmd := exec.Command("wt.exe", args...)
+	if err := cmd.Start(); err != nil {
+		log.Printf("[u-tabs] launch fail: %v", err)
+	}
+}
+
+// buildResumeAction 构建恢复会话动作
+func buildResumeAction(s *Session) SessionAction {
+	title := s.CustomTitle
+	if title == "" {
+		title = s.ID[:8]
+	}
+	return SessionAction{
+		Cwd:       s.Cwd,
+		Title:     "resume: " + title,
+		SessionID: s.ID,
+	}
+}
+
+// buildForkAction 构建分叉会话动作
+func buildForkAction(s *Session, prompt string) SessionAction {
+	title := s.CustomTitle
+	if title == "" {
+		title = s.ID[:8]
+	}
+	return SessionAction{
+		Cwd:       s.Cwd,
+		Title:     "fork: " + title,
+		SessionID: s.ID,
+		Fork:      true,
+		Prompt:    prompt,
+	}
+}
+
+// buildNewAction 构建新建会话动作
+func buildNewAction(cwd string) SessionAction {
+	title := filepath.Base(cwd) + " - new"
+	return SessionAction{
+		Cwd:   cwd,
+		Title: title,
+	}
+}
+
+// buildWorkspaceAction 构建工作空间启动动作
+func buildWorkspaceAction(ws Workspace) SessionAction {
+	return SessionAction{
+		Cwd:    ws.Dir,
+		Title:  ws.Title,
+		Prompt: ws.Prompt,
+		Name:   ws.Title,
+	}
+}
+
+// --- 会话操作 ---
+
+func (m *Model) resumeSelected() (*Model, tea.Cmd) {
+	s := m.currentSession()
+	if s == nil {
+		return m, nil
+	}
+	action := buildResumeAction(s)
+	action.Execute(m)
+	m.launched = "resume: " + s.CustomTitle
+	return m, nil
+}
+
+func (m *Model) newSessionFromHistory() (*Model, tea.Cmd) {
+	s := m.currentSession()
+	cwd := ""
+	if s != nil {
+		cwd = s.Cwd
+	} else {
+		cwd = m.currentDirCwd()
+	}
+	if cwd == "" {
+		return m, nil
+	}
+	action := buildNewAction(cwd)
+	action.Execute(m)
+	m.launched = "new: " + filepath.Base(cwd)
+	return m, nil
+}
+
+func (m *Model) executeFork() (*Model, tea.Cmd) {
+	s := m.currentSession()
+	if s == nil {
+		m.forkMode = false
+		return m, nil
+	}
+	m.forkMode = false
+
+	action := buildForkAction(s, m.forkBuf)
+	m.forkBuf = ""
+	action.Execute(m)
+
+	title := s.CustomTitle
+	if title == "" {
+		title = s.ID[:8]
+	}
+	m.launched = "fork: " + title
+	return m, nil
+}
+
+func (m *Model) launchSelected() (*Model, tea.Cmd) {
+	if len(m.selected) > 0 {
+		var launched []string
+		for idx := range m.selected {
+			ws := &AllWorkspaces[idx]
+			action := buildWorkspaceAction(*ws)
+			action.Execute(m)
+			launched = append(launched, ws.Title)
+		}
+		m.launched = strings.Join(launched, ", ")
+		m.selected = make(map[int]bool)
+		return m, nil
+	}
+	svcs := WorkspacesByGroup(Groups[m.activeGroup].Label)
+	if m.cursor < len(svcs) {
+		ws := svcs[m.cursor]
+		action := buildWorkspaceAction(ws)
+		action.Execute(m)
+		m.launched = ws.Title
+	}
+	return m, nil
+}
+
+func (m *Model) launchByInput() (*Model, tea.Cmd) {
+	num, err := strconv.Atoi(m.inputBuf)
+	if err != nil {
+		m.inputBuf = ""
+		return m, nil
+	}
+	ws := FindByNumber(num)
+	if ws != nil {
+		action := buildWorkspaceAction(*ws)
+		action.Execute(m)
+		m.launched = ws.Title
+	}
+	m.inputBuf = ""
+	return m, nil
+}
--- a/internal/update.go
+++ b/internal/update.go
@@ -7,7 +7,6 @@ import (
 	"io"
 	"net/http"
 	"os"
-	"runtime"
 	"strings"
 	"time"

@@ -15,7 +14,7 @@ import (
 )

 // Version 当前版本，发布时更新
-const Version = "0.1.0"
+const Version = "0.2.0"

 // --- 远程 JSON 结构 ---

@@ -103,7 +102,7 @@ func CheckUpdateCmd() tea.Cmd {
 		}

 		// 查找当前平台的下载信息
-		platformKey := runtime.GOOS + "-" + runtime.GOARCH
+		platformKey := platformKey
 		pi, ok := info.Platforms[platformKey]
 		if !ok {
 			return nil
@@ -192,7 +191,7 @@ func SelfUpdateCmd(downloadURL, expectedSHA256, newVersion string) tea.Cmd {
 		}

 		// Linux/macOS: 设置可执行权限
-		if runtime.GOOS != "windows" {
+		if !isWindows {
 			os.Chmod(exePath, 0755)
 		}

--- a/internal/util.go
+++ b/internal/util.go
@@ -0,0 +1,134 @@
+package internal
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"math/big"
+	"runtime"
+	"strings"
+	"unicode/utf16"
+	"unicode/utf8"
+)
+
+// 平台信息（启动时确定）
+var (
+	isWindows  = runtime.GOOS == "windows"
+	platformKey = runtime.GOOS + "-" + runtime.GOARCH
+)
+
+// toWinPath 将路径中的 / 替换为 \
+func toWinPath(s string) string {
+	return strings.ReplaceAll(s, "/", "\\")
+}
+
+// --- 字符串宽度 ---
+
+func stringWidth(s string) int {
+	w := 0
+	for _, r := range s {
+		w += runeWidth(r)
+	}
+	return w
+}
+
+func runeWidth(r rune) int {
+	if r >= 0x1100 &&
+		(r <= 0x115F || r == 0x2329 || r == 0x232A ||
+			(r >= 0x2E80 && r <= 0xA4CF && r != 0x303F) ||
+			(r >= 0xAC00 && r <= 0xD7A3) ||
+			(r >= 0xF900 && r <= 0xFAFF) ||
+			(r >= 0xFE10 && r <= 0xFE19) ||
+			(r >= 0xFE30 && r <= 0xFE6F) ||
+			(r >= 0xFF01 && r <= 0xFF60) ||
+			(r >= 0xFFE0 && r <= 0xFFE6) ||
+			(r >= 0x20000 && r <= 0x2FFFD) ||
+			(r >= 0x30000 && r <= 0x3FFFD)) {
+		return 2
+	}
+	return 1
+}
+
+func padRightByWidth(s string, targetW int) string {
+	w := stringWidth(s)
+	if w >= targetW {
+		return s
+	}
+	return s + strings.Repeat(" ", targetW-w)
+}
+
+func truncateByWidth(s string, maxW int) string {
+	w := 0
+	for i := 0; i < len(s); {
+		r, size := utf8.DecodeRuneInString(s[i:])
+		rw := runeWidth(r)
+		if w+rw > maxW {
+			return s[:i]
+		}
+		w += rw
+		i += size
+	}
+	return s
+}
+
+func wrapByWidth(s string, maxW int) []string {
+	if maxW <= 0 || s == "" {
+		return []string{s}
+	}
+	var lines []string
+	for s != "" {
+		cut := truncateByWidth(s, maxW)
+		lines = append(lines, cut)
+		s = s[len(cut):]
+	}
+	return lines
+}
+
+func fitWidth(s string, w int) string {
+	return padRightByWidth(truncateByWidth(s, w), w)
+}
+
+// --- 视口 ---
+
+func viewport(cursor, total, height int) (int, int) {
+	if total <= height {
+		return 0, total
+	}
+	half := height / 2
+	start := cursor - half
+	if start < 0 {
+		start = 0
+	}
+	end := start + height
+	if end > total {
+		end = total
+		start = end - height
+		if start < 0 {
+			start = 0
+		}
+	}
+	return start, end
+}
+
+func padLinesTo(lines []string, w, target int) string {
+	for len(lines) < target {
+		lines = append(lines, strings.Repeat(" ", w))
+	}
+	return strings.Join(lines, "\n")
+}
+
+// --- Windows Terminal ---
+
+func encodePSCommand(script string) string {
+	u16 := utf16.Encode([]rune(script))
+	b := make([]byte, len(u16)*2)
+	for i, r := range u16 {
+		b[i*2] = byte(r)
+		b[i*2+1] = byte(r >> 8)
+	}
+	return base64.StdEncoding.EncodeToString(b)
+}
+
+func randRange(min, max int) int {
+	n, _ := rand.Int(rand.Reader, big.NewInt(int64(max-min)))
+	return min + int(n.Int64())
+}
--- a/internal/view.go
+++ b/internal/view.go
@@ -0,0 +1,155 @@
+package internal
+
+import (
+	"fmt"
+	"strings"
+
+	"charm.land/bubbletea/v2"
+	"charm.land/lipgloss/v2"
+	"u-tabs/internal/style"
+)
+
+// --- View 入口 ---
+
+func (m *Model) View() tea.View {
+	v := tea.NewView(m.render())
+	v.AltScreen = true
+	v.MouseMode = tea.MouseModeCellMotion
+	v.WindowTitle = "U-TABS"
+	return v
+}
+
+func (m *Model) render() string {
+	if m.width == 0 {
+		return "loading..."
+	}
+
+	var b strings.Builder
+
+	b.WriteString(m.renderTabBar())
+	b.WriteString("\n")
+	b.WriteString(lipgloss.NewStyle().Foreground(style.BgPanel).Render(strings.Repeat("─", m.width)))
+	b.WriteString("\n")
+
+	if m.IsHistoryTab() {
+		b.WriteString(m.renderHistory())
+	} else {
+		b.WriteString(m.renderWorkspace())
+	}
+
+	// footer
+	b.WriteString("\n")
+	if m.inputBuf != "" {
+		b.WriteString(style.InputStyle.Render(fmt.Sprintf(" ▶ num:%s [Enter]go [Esc]cancel", m.inputBuf)))
+	}
+	if m.forkMode {
+		b.WriteString(style.InputStyle.Render(fmt.Sprintf(" ⎇ fork:%s [Enter]confirm [Esc]cancel", m.forkBuf)))
+	}
+	if m.launched != "" {
+		b.WriteString(lipgloss.NewStyle().Foreground(style.Accent).Render(fmt.Sprintf(" ✓ %s", m.launched)))
+		m.launched = ""
+	}
+	if m.update.Done {
+		b.WriteString(lipgloss.NewStyle().Foreground(style.Success).Bold(true).
+			Render(fmt.Sprintf(" updated to v%s, restart to apply", m.update.NewVersion)))
+	} else if m.update.Error != nil {
+		b.WriteString(lipgloss.NewStyle().Foreground(style.Red).
+			Render(fmt.Sprintf(" update failed: %v", m.update.Error)))
+	} else if m.update.Updating {
+		b.WriteString(lipgloss.NewStyle().Foreground(style.Warning).
+			Render(" updating..."))
+	} else if m.update.Available {
+		b.WriteString(lipgloss.NewStyle().Foreground(style.Warning).Bold(true).
+			Render(fmt.Sprintf(" v%s available [u]update", m.update.NewVersion)))
+	}
+	b.WriteString("\n")
+
+	helpParts := m.renderHelp()
+	helpStr := " " + strings.Join(helpParts, "  ")
+	verStr := lipgloss.NewStyle().Foreground(style.Dim).Render("绝尘 v" + Version)
+	padW := m.width - lipgloss.Width(helpStr) - lipgloss.Width(verStr)
+	if padW > 0 {
+		b.WriteString(helpStr + strings.Repeat(" ", padW) + verStr)
+	} else {
+		b.WriteString(helpStr + "  " + verStr)
+	}
+
+	if hint := ConfigHint(); hint != "" {
+		b.WriteString("\n" + hint)
+	}
+	return b.String()
+}
+
+// renderTabBar 顶部两个主 tab
+func (m *Model) renderTabBar() string {
+	var b strings.Builder
+	b.WriteString(style.TitleStyle.Render(" U-TABS "))
+	sep := style.TabSep.Render(" │ ")
+
+	wsLabel := " 1 工作空间 "
+	if !m.IsHistoryTab() {
+		b.WriteString(lipgloss.NewStyle().
+			Bold(true).Background(style.BgPanel).Foreground(style.Accent).
+			Render(wsLabel))
+	} else {
+		b.WriteString(style.TabInactiveStyle.Render(wsLabel))
+	}
+
+	b.WriteString(sep)
+	histLabel := " 2 历史对话 "
+	if m.IsHistoryTab() {
+		b.WriteString(lipgloss.NewStyle().
+			Bold(true).Background(style.BgPanel).Foreground(style.Cyan).
+			Render(histLabel))
+	} else {
+		b.WriteString(style.TabInactiveStyle.Render(histLabel))
+	}
+
+	return b.String()
+}
+
+func (m *Model) renderHelp() []string {
+	if m.IsHistoryTab() {
+		return []string{
+			m.fmtHelp("↑↓", "sel"),
+			m.fmtHelp("←→", "panel"),
+			m.fmtHelp("Enter", "resume"),
+			m.fmtHelp("f", "star"),
+			m.fmtHelp("n", "new"),
+			m.fmtHelp("c", "fork"),
+			m.fmtHelp("1", "workspace"),
+			m.fmtHelp("r/F5", "refresh"),
+			m.fmtHelp("q", "quit"),
+		}
+	}
+	return []string{
+		m.fmtHelp("←→", "col"),
+		m.fmtHelp("↑↓", "sel"),
+		m.fmtHelp("Enter", "run"),
+		m.fmtHelp("2", "history"),
+		m.fmtHelp("q", "quit"),
+	}
+}
+
+func (m *Model) fmtHelp(key, desc string) string {
+	return lipgloss.NewStyle().Foreground(style.Accent).Render(key) +
+		lipgloss.NewStyle().Foreground(style.Dim).Render(":" + desc)
+}
+
+func renderNavEntry(lines *[]string, w int, label string, activeFg string, isCur, focused bool) {
+	sep := lipgloss.NewStyle().Foreground(style.BgPanel).Render(fitWidth(" ─────────", w))
+	*lines = append(*lines, sep)
+	if isCur {
+		curLabel := " → " + label
+		line := padRightByWidth(truncateByWidth(curLabel, w), w)
+		if focused {
+			*lines = append(*lines, style.SelStyle.Render(line))
+		} else {
+			*lines = append(*lines, lipgloss.NewStyle().Foreground(lipgloss.Color(activeFg)).Bold(true).Render(line))
+		}
+	} else {
+		inactiveLabel := "   " + label
+		line := padRightByWidth(truncateByWidth(inactiveLabel, w), w)
+		*lines = append(*lines, lipgloss.NewStyle().Foreground(style.Dim).Render(line))
+	}
+}
--- a/internal/view_hist.go
+++ b/internal/view_hist.go
@@ -0,0 +1,255 @@
+package internal
+
+import (
+	"fmt"
+	"strings"
+
+	"charm.land/lipgloss/v2"
+	"u-tabs/internal/style"
+)
+
+// --- HISTORY 三栏渲染 ---
+
+func (m *Model) renderHistory() string {
+	if !m.history.Loaded && !m.history.Scanning {
+		return style.ScanningStyle.Render("  press Tab to load sessions...")
+	}
+	if len(m.history.Projects) == 0 && m.history.Scanning {
+		return style.ScanningStyle.Render("  scanning sessions...")
+	}
+	if len(m.history.Projects) == 0 {
+		return style.SubtitleStyle.Render("  no sessions found")
+	}
+
+	avail := m.width - 8
+	dirW := max(18, avail*20/100)
+	sessW := max(28, avail*40/100)
+	detailW := avail - dirW - sessW
+	listH := max(3, m.height-7)
+
+	dirCw := dirW - 2
+	sessCw := sessW - 2
+	detailCw := detailW - 2
+
+	dirLines := m.dirColumnLines(dirCw, listH-1)
+	sessLines := m.sessColumnLines(sessCw, listH-1)
+	detailLines := m.detailColumnLines(detailCw, listH-1)
+
+	maxRows := min(listH-1, max(max(len(dirLines), len(sessLines)), len(detailLines)))
+
+	panelSty := lipgloss.NewStyle().
+		Border(lipgloss.RoundedBorder()).
+		BorderForeground(style.BgPanel)
+
+	dirBox := panelSty.Width(dirW).Render(
+		style.DetailTitle.Render("dirs") + "\n" + padLinesTo(dirLines, dirCw, maxRows))
+	sessBox := panelSty.Width(sessW).Render(
+		style.DetailTitle.Render("sessions") + "\n" + padLinesTo(sessLines, sessCw, maxRows))
+	detailBox := panelSty.Width(detailW).Render(
+		style.DetailTitle.Render("detail") + "\n" + padLinesTo(detailLines, detailCw, maxRows))
+
+	return lipgloss.JoinHorizontal(lipgloss.Top, dirBox, " ", sessBox, " ", detailBox)
+}
+
+func (m *Model) dirColumnLines(w, listH int) []string {
+	var lines []string
+	total := len(m.history.Projects) + 3
+	start, end := viewport(m.history.DirCursor, total, listH)
+
+	prefixW := 3
+
+	buildDirLine := func(cur, name, cnt string, selected bool) string {
+		cntW := stringWidth(cnt)
+		nameW := max(2, w-prefixW-cntW)
+		name = truncateByWidth(name, nameW)
+		line := " " + cur + " " + padRightByWidth(name, nameW) + cnt
+		sty := style.NormStyle
+		if selected {
+			sty = style.SelStyle
+		}
+		return sty.Render(padRightByWidth(truncateByWidth(line, w), w))
+	}
+
+	// 0: 全部
+	if start == 0 {
+		totalSess := 0
+		for _, pd := range m.history.Projects {
+			totalSess += len(pd.Sessions)
+		}
+		cur := " "
+		if m.history.DirCursor == 0 {
+			cur = "▸"
+		}
+		lines = append(lines, buildDirLine(cur, "全部", fmt.Sprintf("(%d)", totalSess),
+			m.history.DirCursor == 0 && m.history.FocusPanel == 0))
+	}
+
+	// 1: 收藏
+	if start <= 1 && end > 1 {
+		favCnt := countFavorites(m.history.Projects, m.history.Favorites)
+		cur := " "
+		if m.history.DirCursor == 1 {
+			cur = "▸"
+		}
+		lines = append(lines, buildDirLine(cur, "★ 收藏", fmt.Sprintf("(%d)", favCnt),
+			m.history.DirCursor == 1 && m.history.FocusPanel == 0))
+	}
+
+	// 2..N+1: 项目目录
+	for i := 0; i < len(m.history.Projects); i++ {
+		idx := i + 2
+		if idx < start || idx >= end {
+			continue
+		}
+		pd := m.history.Projects[i]
+		cur := " "
+		if m.history.DirCursor == idx {
+			cur = "▸"
+		}
+		lines = append(lines, buildDirLine(cur, pd.DirShort, fmt.Sprintf("(%d)", len(pd.Sessions)),
+			m.history.DirCursor == idx && m.history.FocusPanel == 0))
+	}
+
+	// N+2: 回到工作空间入口
+	backIdx := len(m.history.Projects) + 2
+	if end > backIdx {
+		renderNavEntry(&lines, w, "工作空间", "#7aa2f7", m.history.DirCursor == backIdx, m.history.FocusPanel == 0)
+	}
+	return lines
+}
+
+func (m *Model) sessColumnLines(w, listH int) []string {
+	sessions := m.currentSessions()
+	if len(sessions) == 0 {
+		return []string{style.SubtitleStyle.Render(fitWidth("  no sessions", w))}
+	}
+
+	prefixW := 16
+	textW := max(8, w-prefixW)
+
+	type sessBlock struct {
+		lines []string
+	}
+	var blocks []sessBlock
+	totalLines := 0
+	curLineOffset := 0
+
+	for i, s := range sessions {
+		cur := "  "
+		if i == m.history.SessCursor {
+			cur = "▸ "
+		}
+		timeStr := s.StartTime.Local().Format("01-02 15:04")
+		favMark := " "
+		if m.history.Favorites[s.ID] {
+			favMark = "★"
+		}
+		title := s.DisplayTitle()
+
+		wrapped := wrapByWidth(title, textW)
+		if len(wrapped) == 0 {
+			wrapped = []string{""}
+		}
+
+		sty := style.NormStyle
+		if i == m.history.SessCursor && m.history.FocusPanel == 1 {
+			sty = style.SelStyle
+		}
+
+		var blockLines []string
+		for li, part := range wrapped {
+			var line string
+			if li == 0 {
+				line = fmt.Sprintf(" %s%s%s %s", cur, timeStr, favMark, part)
+			} else {
+				line = strings.Repeat(" ", prefixW+1) + part
+			}
+			blockLines = append(blockLines, sty.Render(padRightByWidth(truncateByWidth(line, w), w)))
+		}
+
+		if i == m.history.SessCursor {
+			curLineOffset = totalLines
+		}
+		totalLines += len(blockLines)
+		blocks = append(blocks, sessBlock{lines: blockLines})
+	}
+
+	startLine, endLine := viewport(curLineOffset, totalLines, listH)
+
+	var allLines []string
+	for _, b := range blocks {
+		allLines = append(allLines, b.lines...)
+	}
+	if endLine > len(allLines) {
+		endLine = len(allLines)
+	}
+	return allLines[startLine:endLine]
+}
+
+func (m *Model) detailColumnLines(w, listH int) []string {
+	s := m.currentSession()
+	if s == nil {
+		return []string{lipgloss.NewStyle().Foreground(style.Dim).Render(fitWidth(" ← select to view", w))}
+	}
+
+	sepSty := lipgloss.NewStyle().Foreground(style.BgPanel)
+	var lines []string
+
+	favPrefix := " "
+	if m.history.Favorites[s.ID] {
+		favPrefix = "★ "
+	}
+	lines = append(lines, style.DetailTitle.Render(fitWidth(favPrefix+s.DisplayTitle(), w)))
+	lines = append(lines, sepSty.Render(fitWidth(strings.Repeat("─", w), w)))
+
+	fav := "-"
+	if m.history.Favorites[s.ID] {
+		fav = "★"
+	}
+	kvRows := []struct{ k, v string }{
+		{"dir", s.Cwd},
+		{"time", fmt.Sprintf("%s ~ %s", s.StartTime.Local().Format("01-02 15:04"), s.EndTime.Local().Format("15:04"))},
+		{"msgs", fmt.Sprintf("%d", s.MsgCount)},
+		{"fav", fav},
+	}
+	for _, r := range kvRows {
+		line := fmt.Sprintf("  %-4s %s", r.k, r.v)
+		lines = append(lines, style.NormStyle.Render(fitWidth(line, w)))
+	}
+
+	if summary := s.DisplaySummary(); summary != "" {
+		lines = append(lines, sepSty.Render(fitWidth(strings.Repeat("─", w), w)))
+		lines = append(lines, style.SessionSummaryStyle.Render(fitWidth("  "+summary, w)))
+	}
+
+	if len(s.Completed) > 0 {
+		lines = append(lines, sepSty.Render(fitWidth(strings.Repeat("─", w), w)))
+		lines = append(lines, lipgloss.NewStyle().Foreground(style.Success).Bold(true).Render(fitWidth(" ✓ 已完成", w)))
+		for _, item := range s.Completed {
+			lines = append(lines, style.NormStyle.Render(fitWidth("   · "+cleanText(item), w)))
+		}
+	}
+
+	if len(s.Pending) > 0 {
+		lines = append(lines, sepSty.Render(fitWidth(strings.Repeat("─", w), w)))
+		lines = append(lines, lipgloss.NewStyle().Foreground(style.Warning).Bold(true).Render(fitWidth(" ○ 待办", w)))
+		for _, item := range s.Pending {
+			lines = append(lines, style.NormStyle.Render(fitWidth("   · "+cleanText(item), w)))
+		}
+	}
+
+	lines = append(lines, lipgloss.NewStyle().Foreground(style.Dim).Render(fitWidth("  [Enter]resume", w)))
+
+	if s.ForkFrom != "" {
+		forkID := s.ForkFrom
+		if len(forkID) > 8 {
+			forkID = forkID[:8]
+		}
+		lines = append(lines, lipgloss.NewStyle().Foreground(style.Cyan).Render(fitWidth(fmt.Sprintf("  ⎇ fork from %s", forkID), w)))
+	}
+
+	if len(lines) > listH {
+		lines = lines[:listH]
+	}
+	return lines
+}
--- a/internal/view_ws.go
+++ b/internal/view_ws.go
@@ -0,0 +1,189 @@
+package internal
+
+import (
+	"fmt"
+	"strings"
+
+	"charm.land/lipgloss/v2"
+	"u-tabs/internal/style"
+)
+
+// --- Workspace 三栏渲染 ---
+
+func (m *Model) renderWorkspace() string {
+	g := Groups[m.activeGroup]
+	svcs := WorkspacesByGroup(g.Label)
+	if len(svcs) == 0 {
+		return style.SubtitleStyle.Render("  empty")
+	}
+
+	avail := m.width - 8
+	tabW := max(14, min(20, avail*18/100))
+	listW := max(30, avail*45/100)
+	detailW := avail - tabW - listW
+
+	tabCw := tabW - 2
+	listCw := listW - 2
+	detailCw := detailW - 2
+
+	listH := max(3, m.height-7)
+
+	tabLines := m.tabsColumnLines(tabCw, listH-1)
+	svcLines := m.wsListLines(g, svcs, listCw, listH-1)
+	detailLines := m.wsDetailLines(svcs, detailCw, listH-1)
+
+	maxRows := min(listH-1, max(max(len(tabLines), len(svcLines)), len(detailLines)))
+
+	tabBorderFg := style.BgPanel
+	if m.wsFocus == 0 {
+		tabBorderFg = style.Accent
+	}
+	listBorderFg := style.BgPanel
+	if m.wsFocus == 1 {
+		listBorderFg = style.Accent
+	}
+
+	panelSty := lipgloss.NewStyle().Border(lipgloss.RoundedBorder())
+
+	tabBox := panelSty.BorderForeground(tabBorderFg).Width(tabW).Render(
+		style.DetailTitle.Render("tabs") + "\n" + padLinesTo(tabLines, tabCw, maxRows))
+	listBox := panelSty.BorderForeground(listBorderFg).Width(listW).Render(
+		style.DetailTitle.Render(g.Label) + "\n" + padLinesTo(svcLines, listCw, maxRows))
+	detailBox := panelSty.BorderForeground(style.BgPanel).Width(detailW).Render(
+		style.DetailTitle.Render("detail") + "\n" + padLinesTo(detailLines, detailCw, maxRows))
+
+	return lipgloss.JoinHorizontal(lipgloss.Top, tabBox, " ", listBox, " ", detailBox)
+}
+
+func (m *Model) tabsColumnLines(w, listH int) []string {
+	var lines []string
+	total := len(Groups) + 1
+	start, end := viewport(m.wsTabCur, total, listH)
+
+	focused := m.wsFocus == 0
+
+	for i := start; i < end; i++ {
+		if i == len(Groups) {
+			renderNavEntry(&lines, w, "历史对话", "#7dcfff", m.wsTabCur == i, focused)
+			continue
+		}
+
+		g := Groups[i]
+		label := g.Label
+		gs := style.GroupStyles[g.Label]
+		isActive := m.wsTabCur == i
+		if isActive {
+			line := " ▸ " + label
+			line = padRightByWidth(truncateByWidth(line, w), w)
+			if focused && gs.GetForeground() != (lipgloss.Color("")) {
+				sty := lipgloss.NewStyle().Foreground(style.BgDark).Background(gs.GetForeground()).Bold(true)
+				lines = append(lines, sty.Render(line))
+			} else if gs.GetForeground() != (lipgloss.Color("")) {
+				sty := lipgloss.NewStyle().Foreground(gs.GetForeground()).Bold(true)
+				lines = append(lines, sty.Render(line))
+			} else {
+				lines = append(lines, style.SelStyle.Render(line))
+			}
+		} else {
+			line := "   " + label
+			line = padRightByWidth(truncateByWidth(line, w), w)
+			if gs.GetForeground() != (lipgloss.Color("")) {
+				lines = append(lines, gs.Render(line))
+			} else {
+				lines = append(lines, style.NormStyle.Render(line))
+			}
+		}
+	}
+	return lines
+}
+
+func (m *Model) wsListLines(g Group, svcs []Workspace, w, listH int) []string {
+	start, end := viewport(m.cursor, len(svcs), listH)
+
+	maxTitleW := 0
+	for _, ws := range svcs {
+		if tw := stringWidth(ws.Title); tw > maxTitleW {
+			maxTitleW = tw
+		}
+	}
+
+	var lines []string
+	for i := start; i < end; i++ {
+		ws := svcs[i]
+		cur := " "
+		if i == m.cursor {
+			cur = "▸"
+		}
+		mark := " "
+		if m.selected[ws.Index] {
+			mark = "✓"
+		}
+
+		paddedTitle := padRightByWidth(ws.Title, maxTitleW)
+
+		if i == m.cursor {
+			prefix := cur + " " + mark + " " + fmt.Sprintf("%02d", ws.N) + " "
+			remainW := max(10, w-stringWidth(prefix))
+			text := truncateByWidth(paddedTitle+"  "+ws.Prompt, remainW)
+			sty := style.SelStyle
+			if m.wsFocus != 1 {
+				sty = lipgloss.NewStyle().Foreground(style.Accent).Bold(true)
+			}
+			lines = append(lines, sty.Render(padRightByWidth(truncateByWidth(prefix+text, w), w)))
+		} else {
+			markStr := " "
+			if m.selected[ws.Index] {
+				markStr = style.MarkStyle.Render("✓")
+			}
+			num := style.NumStyle.Render(fmt.Sprintf("%02d", ws.N))
+			prefix := cur + " " + markStr + " " + num + " "
+			remainW := max(10, w-stringWidth(prefix))
+			text := truncateByWidth(paddedTitle+"  "+ws.Prompt, remainW)
+			lines = append(lines, style.NormStyle.Render(padRightByWidth(truncateByWidth(prefix+text, w), w)))
+		}
+	}
+	return lines
+}
+
+func (m *Model) wsDetailLines(svcs []Workspace, w, listH int) []string {
+	if m.cursor >= len(svcs) {
+		return []string{lipgloss.NewStyle().Foreground(style.Dim).Render(fitWidth(" ← select to view", w))}
+	}
+
+	ws := svcs[m.cursor]
+	sepSty := lipgloss.NewStyle().Foreground(style.BgPanel)
+	var lines []string
+
+	lines = append(lines, style.DetailTitle.Render(fitWidth(" "+ws.Title, w)))
+	lines = append(lines, sepSty.Render(fitWidth(strings.Repeat("─", w), w)))
+
+	rows := []struct {
+		key string
+		val string
+		sty lipgloss.Style
+	}{
+		{"dir", ws.Dir, style.ValStyle},
+		{"no", fmt.Sprintf("%02d · %s", ws.N, ws.Group), style.NumStyle},
+		{"desc", ws.Prompt, style.ValStyle},
+		{"tech", ws.Tech, style.TechStyle},
+		{"deploy", ws.Deploy, style.DeployStyle},
+	}
+	for _, r := range rows {
+		line := fmt.Sprintf("  %-6s %s", r.key, r.sty.Render(r.val))
+		lines = append(lines, style.NormStyle.Render(fitWidth(line, w)))
+	}
+
+	lines = append(lines, sepSty.Render(fitWidth(strings.Repeat("─", w), w)))
+
+	hintCmd := "wt"
+	if !isWindows {
+		hintCmd = "bash"
+	}
+	lines = append(lines, lipgloss.NewStyle().Foreground(style.Accent).Italic(true).Render(fitWidth("  $ "+hintCmd+" → CC @"+ws.Title, w)))
+	lines = append(lines, lipgloss.NewStyle().Foreground(style.Dim).Render(fitWidth("  [Enter]start  [Space]multi", w)))
+
+	if len(lines) > listH {
+		lines = lines[:listH]
+	}
+	return lines
+}
Author	SHA1	Message	Date
绝尘	36aeef4bb7	新增: 会话分叉功能，优化增量扫描缓存 - 会话分叉: 按 c 键从历史会话分叉，支持带方向提示 - 启动自动加载历史记录 - 增量扫描: 缓存内存化、目录 modTime 跳过、已删除条目裁剪 - 刷新按钮复用 onTabSwitch 单一入口	2026-05-31 21:40:20 +08:00
绝尘	0bd9848df9	新增: 会话分叉功能，优化增量扫描缓存 - 新增 c 键触发会话分叉，支持带方向提示的分叉输入 - 使用 claude --fork-session 原生分叉，不污染原会话 - Init() 启动时自动触发历史扫描，无需手动切 tab - 缓存提升到 HistoryState 内存持有，避免重复 I/O - 新增项目目录 modTime 增量扫描，未变目录跳过遍历 - 扫描后裁剪缓存，删除磁盘已不存在的条目 - updateSummaryInCache 直接操作内存缓存	2026-05-28 16:18:32 +08:00
绝尘	a6d5c024e7	发布: v0.1.1	2026-05-22 16:25:32 +08:00
绝尘	ef32867f10	优化: 品牌升级U-TABS，默认打开历史对话	2026-05-22 16:25:00 +08:00