Restore VRTW_Tool title; note discord mute regression

VRWT_Tool/VRC_OSC/internal/app/state.go

@@ -1,6 +1,14 @@
 package app
 
-import "sync"
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+
+	"vrc_osc_go/internal/common"
+)
 
 type RuntimeState struct {
 	mu             sync.RWMutex
@@ -14,30 +22,42 @@ var runtimeState = &RuntimeState{}
 var guestTracker *GuestTracker
 
 func SetGuestTracker(t *GuestTracker) { guestTracker = t }
+func InitGuestTracker(t *GuestTracker) {
+	guestTracker = t
+	if guestTracker != nil {
+		guestTracker.mu.Lock()
+		_ = guestTracker.persistLocked()
+		guestTracker.mu.Unlock()
+	}
+}
 func GetGuestTracker() *GuestTracker  { return guestTracker }
 
 func SetDiscordMuted(v bool) {
 	runtimeState.mu.Lock()
-	defer runtimeState.mu.Unlock()
 	runtimeState.DiscordMuted = v
+	runtimeState.mu.Unlock()
+	_ = persistRuntimeState()
 }
 
 func SetOCRText(v string) {
 	runtimeState.mu.Lock()
-	defer runtimeState.mu.Unlock()
 	runtimeState.LastOCRText = v
+	runtimeState.mu.Unlock()
+	_ = persistRuntimeState()
 }
 
 func SetTranslateText(v string) {
 	runtimeState.mu.Lock()
-	defer runtimeState.mu.Unlock()
 	runtimeState.LastTranslate = v
+	runtimeState.mu.Unlock()
+	_ = persistRuntimeState()
 }
 
 func SetCurrentWorld(v string) {
 	runtimeState.mu.Lock()
-	defer runtimeState.mu.Unlock()
 	runtimeState.CurrentWorld = v
+	runtimeState.mu.Unlock()
+	_ = persistRuntimeState()
 }
 
 func SnapshotRuntime() RuntimeState {
@@ -45,3 +65,25 @@ func SnapshotRuntime() RuntimeState {
 	defer runtimeState.mu.RUnlock()
 	return *runtimeState
 }
+
+func persistRuntimeState() error {
+	s := SnapshotRuntime()
+	dir := filepath.Join(common.RootDir(), "runtime")
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return err
+	}
+	f, err := os.Create(filepath.Join(dir, "state.json"))
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	enc := json.NewEncoder(f)
+	enc.SetIndent("", "  ")
+	return enc.Encode(map[string]any{
+		"discord_muted": s.DiscordMuted,
+		"ocr":           s.LastOCRText,
+		"translate":     s.LastTranslate,
+		"world":         s.CurrentWorld,
+		"updated_at":    time.Now().Format(time.RFC3339),
+	})
+}