新增: AI 摘要生成 (claude -p)

扫描完成后自动逐个调用 claude -p 生成会话标题,
摘要缓存到 ~/.u-tabs/session-cache.json, 下次免重复调用

internal/app.go

@@ -56,7 +56,10 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.history.Projects = msg.Projects
 		m.history.Loaded = true
 		m.history.Scanning = false
-		return m, nil
+		return m, m.nextSummaryCmd()
+	case SummaryResultMsg:
+		m.applySummary(msg.SessionID, msg.Summary)
+		return m, m.nextSummaryCmd()
 	}
 	return m, nil
 }
@@ -222,6 +225,34 @@ func (m *Model) resumeSelected() (*Model, tea.Cmd) {
 	return m, nil
 }
 
+
+// --- AI 摘要 ---
+
+func (m *Model) applySummary(sessionID, summary string) {
+	if summary == "" {
+		return
+	}
+	for _, pd := range m.history.Projects {
+		for _, s := range pd.Sessions {
+			if s.ID == sessionID {
+				s.AISummary = summary
+				saveSummaryToCache(sessionID, summary)
+				return
+			}
+		}
+	}
+}
+
+func (m *Model) nextSummaryCmd() tea.Cmd {
+	for _, pd := range m.history.Projects {
+		for _, s := range pd.Sessions {
+			if s.AISummary == "" && s.FilePath != "" && s.FirstMsg != "" {
+				return generateSummaryCmd(s.FilePath, s.ID)
+			}
+		}
+	}
+	return nil
+}
 // --- Workspace 光标 ---
 
 func (m *Model) moveCursor(dir int) {