Monitor: show the web UI URL when LISTEN_UI is active

The status snapshot carries the UI address; the monitor renders it as a
dim 'UI: http://…' line below the GPU line.

cmd/gpu-turnstile/main.go

@@ -1164,6 +1164,8 @@ type statusSnapshot struct {
 	// false when game detection (and with it nvidia-smi polling) is not
 	// configured.
 	GPU statusGPU `json:"gpu"`
+	// UI is the web UI's URL when LISTEN_UI is active, empty otherwise.
+	UI string `json:"ui,omitempty"`
 	// MonitorNote is set client-side (never over the wire) when the
 	// monitor's own binary differs from the service's version.
 	MonitorNote string `json:"-"`
@@ -1232,6 +1234,7 @@ func statusProvider(cfg config.Config, lk *lock.Lock, comfySup *supervise.Proces
 		snap := statusSnapshot{
 			Version: version,
 			UptimeS: int64(time.Since(started).Seconds()),
+			UI:      uiURL(cfg.ListenUI),
 		}
 		st, known, foreign, ageS := gw.get()
 		snap.GPU = statusGPU{

cmd/gpu-turnstile/monitor.go

@@ -211,6 +211,9 @@ func renderMonitor(snap statusSnapshot, width int) string {
 	if snap.GPU.Enabled {
 		b.WriteString(renderGPU(snap.GPU) + "\x1b[K\n")
 	}
+	if snap.UI != "" {
+		b.WriteString(" " + cDim + "UI: " + snap.UI + cReset + "\x1b[K\n")
+	}
 	if snap.MonitorNote != "" {
 		b.WriteString(" " + cYellow + snap.MonitorNote + cReset + "\x1b[K\n")
 	}

cmd/gpu-turnstile/monitor_test.go

@@ -66,6 +66,12 @@ func TestRenderMonitor(t *testing.T) {
 	if strings.Contains(frame, "busy") {
 		t.Errorf("idle lock still shows busy:\n%s", frame)
 	}
+
+	snap.UI = "http://127.0.0.1:7860"
+	frame = renderMonitor(snap, 80)
+	if !strings.Contains(frame, "UI: http://127.0.0.1:7860") {
+		t.Errorf("frame missing UI line:\n%s", frame)
+	}
 }
 
 func TestFmtDur(t *testing.T) {

cmd/gpu-turnstile/webui.go

@@ -79,6 +79,19 @@ func isLoopbackHost(host string) bool {
 	return ip != nil && ip.IsLoopback()
 }
 
+// uiURL renders a LISTEN_UI address as a browsable URL ("" when disabled).
+// A wildcard host reads as 127.0.0.1 — that's where the browser is usually
+// running.
+func uiURL(addr string) string {
+	if addr == "" {
+		return ""
+	}
+	if strings.HasPrefix(addr, ":") {
+		addr = "127.0.0.1" + addr
+	}
+	return "http://" + addr
+}
+
 // uiPage is the whole web UI: a terminal-styled page that polls /api/status
 // once a second and renders the same lines as --monitor. The buttons (and
 // the u/r keys) hit the action endpoints, like the monitor's hotkeys.

cmd/gpu-turnstile/webui_test.go

@@ -170,3 +170,16 @@ func TestIsLoopbackHost(t *testing.T) {
 		}
 	}
 }
+
+func TestUIURL(t *testing.T) {
+	for addr, want := range map[string]string{
+		"":                 "",
+		"127.0.0.1:7860":   "http://127.0.0.1:7860",
+		":7860":            "http://127.0.0.1:7860",
+		"192.168.1.5:9000": "http://192.168.1.5:9000",
+	} {
+		if got := uiURL(addr); got != want {
+			t.Errorf("uiURL(%q) = %q, want %q", addr, got, want)
+		}
+	}
+}