feat: implement system tray interface and manage OS thread locking for cross-platform stability

internal/ui/tray/tray.go

@@ -5,6 +5,7 @@ package tray
 import (
 	_ "embed"
 	"os"
+	"runtime"
 	"strings"
 
 	"wis-free-v3/internal/config"
@@ -40,6 +41,12 @@ var statusMenuItem *systray.MenuItem
 // Start initializes and runs the system tray.
 // This function blocks until the tray is terminated.
 func Start(app App) {
+	// Pin this goroutine to one OS thread for the whole lifetime of systray.Run.
+	// getlantern/systray creates the notify icon and runs the Win32 message pump on
+	// whichever thread calls Run; if the goroutine migrates between threads, callbacks
+	// and the tray context menu break until restart (often seen after sleep/resume).
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
 	systray.Run(
 		func() { onReady(app) },
 		onExit,