feat(02-03): main.go subcommands + display enrichi avec workspace, label, duree

- main.go dispatch list/switch/label/stop/daemon via client socket
- DisplaySessionInfos affiche [ws:N], label entre guillemets, "depuis X min"
- formatDuration pour duree relative humaine (< 1 min, 3 min, 1 h 5 min)
- Daemon mode integre i3 + X11 avec degradation gracieuse
- Tests complets pour tous les champs optionnels du display

display.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io"
 	"strings"
+	"time"
 )
 
 const (
@@ -50,6 +51,86 @@ func DisplaySessions(w io.Writer, sessions []Session, noColor bool) {
 	}
 }
 
+// DisplaySessionInfos writes a formatted list of SessionInfo (from daemon) to w.
+// Includes workspace, label, and waiting duration.
+func DisplaySessionInfos(w io.Writer, sessions []SessionInfo, noColor bool, now time.Time) {
+	if len(sessions) == 0 {
+		fmt.Fprintln(w, "No active Claude Code sessions found.")
+		return
+	}
+
+	for i, s := range sessions {
+		if i > 0 {
+			fmt.Fprintln(w)
+		}
+
+		stateStr := stateColorStr(s.State, noColor) + s.State + resetIfColor(noColor)
+
+		branch := ""
+		if s.GitBranch != "" {
+			branch = " (" + s.GitBranch + ")"
+		}
+
+		workspace := ""
+		if s.Workspace != "" {
+			workspace = " [ws:" + s.Workspace + "]"
+		}
+
+		label := ""
+		if s.Label != "" {
+			label = fmt.Sprintf(" %q", s.Label)
+		}
+
+		waiting := ""
+		if s.WaitingSince != nil {
+			waiting = " (depuis " + formatDuration(now.Sub(*s.WaitingSince)) + ")"
+		}
+
+		fmt.Fprintf(w, "[%s] %s%s%s%s%s\n", stateStr, s.Cwd, branch, workspace, label, waiting)
+
+		if s.Preview != "" {
+			lines := strings.Split(s.Preview, "\n")
+			for _, line := range lines {
+				fmt.Fprintf(w, "         %s\n", line)
+			}
+		}
+	}
+}
+
+// formatDuration returns a human-readable relative duration.
+func formatDuration(d time.Duration) string {
+	if d < time.Minute {
+		return "< 1 min"
+	}
+
+	hours := int(d.Hours())
+	minutes := int(d.Minutes()) % 60
+
+	if hours > 0 {
+		if minutes > 0 {
+			return fmt.Sprintf("%d h %d min", hours, minutes)
+		}
+		return fmt.Sprintf("%d h", hours)
+	}
+	return fmt.Sprintf("%d min", minutes)
+}
+
+func stateColorStr(state string, noColor bool) string {
+	if noColor {
+		return ""
+	}
+	switch state {
+	case "Working":
+		return colorGreen
+	case "Needs Input":
+		return colorYellow
+	case "Idle":
+		return colorGray
+	default:
+		return colorGray
+	}
+}
+
 func stateColor(state SessionState, noColor bool) string {
 	if noColor {
 		return ""