Restore VRTW_Tool title; note discord mute regression

VRWT_Tool/VRC_OSC/internal/app/guest_status.go

@@ -2,9 +2,14 @@ package app
 
 import (
 	"fmt"
+	"encoding/json"
+	"os"
+	"path/filepath"
 	"sort"
 	"sync"
 	"time"
+
+	"vrc_osc_go/internal/common"
 )
 
 type GuestStatus struct {
@@ -48,6 +53,7 @@ func (t *GuestTracker) MarkJoin(name string, at time.Time) {
 	s.Present = true
 	s.LastJoin = at
 	s.AbsentFor = ""
+	_ = t.persistLocked()
 }
 
 func (t *GuestTracker) MarkLeave(name string, at time.Time) {
@@ -59,6 +65,7 @@ func (t *GuestTracker) MarkLeave(name string, at time.Time) {
 	if !s.LastJoin.IsZero() {
 		s.AbsentFor = humanSince(at)
 	}
+	_ = t.persistLocked()
 }
 
 func (t *GuestTracker) Snapshot(now time.Time) []GuestStatus {
@@ -76,6 +83,26 @@ func (t *GuestTracker) Snapshot(now time.Time) []GuestStatus {
 	return out
 }
 
+func (t *GuestTracker) persistLocked() error {
+	dir := filepath.Join(common.RootDir(), "runtime")
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return err
+	}
+	snapshot := make([]GuestStatus, 0, len(t.items))
+	for _, s := range t.items {
+		cp := *s
+		snapshot = append(snapshot, cp)
+	}
+	f, err := os.Create(filepath.Join(dir, "guest_snapshot.json"))
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	enc := json.NewEncoder(f)
+	enc.SetIndent("", "  ")
+	return enc.Encode(snapshot)
+}
+
 func (t *GuestTracker) ensure(name string) *GuestStatus {
 	if s, ok := t.items[name]; ok {
 		return s