toolbar拓展布局自适应优化，以及场景切换分组：初始场景、默认包、其他场景。

UnityProject/Assets/Editor/ToolbarExtender/UnityToolbarExtenderLeft/SceneLauncher.cs

@@ -0,0 +1,118 @@
+using UnityEditor;
+using UnityEditor.SceneManagement;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+using UnityToolbarExtender;
+
+namespace TEngine
+{
+    public partial class UnityToolbarExtenderLeft
+    {
+        private const string PreviousSceneKey = "TEngine_PreviousScenePath"; // 用于存储之前场景路径的键
+        private const string IsLauncherBtn = "TEngine_IsLauncher"; // 用于存储之前是否按下launcher
+
+        private static readonly string SceneMain = "main";
+
+        private static readonly string ButtonStyleName = "Tab middle";
+        private static GUIStyle _buttonGuiStyle;
+        
+        private static void OnToolbarGUI_SceneLauncher()
+        {
+            _buttonGuiStyle ??= new GUIStyle(ButtonStyleName)
+            {
+                padding = new RectOffset(2, 8, 2, 2),
+                alignment = TextAnchor.MiddleCenter,
+                fontStyle = FontStyle.Bold
+            };
+
+            GUILayout.FlexibleSpace();
+            if (GUILayout.Button(
+                    new GUIContent("Launcher", EditorGUIUtility.FindTexture("PlayButton"), "Start Scene Launcher"),
+                    _buttonGuiStyle))
+                SceneHelper.StartScene(SceneMain);
+        }
+
+        private static void OnPlayModeStateChanged(PlayModeStateChange state)
+        {
+            if (state == PlayModeStateChange.EnteredEditMode)
+            {
+                // 从 EditorPrefs 读取之前的场景路径
+                var previousScenePath = EditorPrefs.GetString(PreviousSceneKey, string.Empty);
+                if (!string.IsNullOrEmpty(previousScenePath) && EditorPrefs.GetBool(IsLauncherBtn))
+                {
+                    EditorApplication.delayCall += () =>
+                    {
+                        if (EditorSceneManager.SaveCurrentModifiedScenesIfUserWantsTo())
+                            EditorSceneManager.OpenScene(previousScenePath);
+                    };
+                }
+
+                EditorPrefs.SetBool(IsLauncherBtn, false);
+            }
+        }
+
+        private static void OnEditorQuit()
+        {
+            EditorPrefs.SetString(PreviousSceneKey, "");
+            EditorPrefs.SetBool(IsLauncherBtn, false);
+        }
+
+        private static class SceneHelper
+        {
+            private static string _sceneToOpen;
+
+            public static void StartScene(string sceneName)
+            {
+                if (EditorApplication.isPlaying) EditorApplication.isPlaying = false;
+
+                // 记录当前场景路径到 EditorPrefs
+                var activeScene = SceneManager.GetActiveScene();
+                if (activeScene.isLoaded && activeScene.name != SceneMain)
+                {
+                    EditorPrefs.SetString(PreviousSceneKey, activeScene.path);
+                    EditorPrefs.SetBool(IsLauncherBtn, true);
+                }
+
+                _sceneToOpen = sceneName;
+                EditorApplication.update += OnUpdate;
+            }
+
+            private static void OnUpdate()
+            {
+                if (_sceneToOpen == null ||
+                    EditorApplication.isPlaying || EditorApplication.isPaused ||
+                    EditorApplication.isCompiling || EditorApplication.isPlayingOrWillChangePlaymode)
+                    return;
+
+                EditorApplication.update -= OnUpdate;
+
+                if (EditorSceneManager.SaveCurrentModifiedScenesIfUserWantsTo())
+                {
+                    string[] guids = AssetDatabase.FindAssets("t:scene " + _sceneToOpen, null);
+                    if (guids.Length == 0)
+                    {
+                        Debug.LogWarning("Couldn't find scene file");
+                    }
+                    else
+                    {
+                        string scenePath = null;
+                        // 优先打开完全匹配_sceneToOpen的场景
+                        for (var i = 0; i < guids.Length; i++)
+                        {
+                            scenePath = AssetDatabase.GUIDToAssetPath(guids[i]);
+                            if (scenePath.EndsWith("/" + _sceneToOpen + ".unity")) break;
+                        }
+
+                        // 如果没有完全匹配的场景，默认显示找到的第一个场景
+                        if (string.IsNullOrEmpty(scenePath)) scenePath = AssetDatabase.GUIDToAssetPath(guids[0]);
+
+                        EditorSceneManager.OpenScene(scenePath);
+                        EditorApplication.isPlaying = true;
+                    }
+                }
+
+                _sceneToOpen = null;
+            }
+        }
+    }
+}

UnityProject/Assets/Editor/ToolbarExtender/UnityToolbarExtenderLeft/SceneLauncher.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 2f6d2ca3d3b34950a79294e49dd9d016
+timeCreated: 1742389721

UnityProject/Assets/Editor/ToolbarExtender/UnityToolbarExtenderLeft/UnityToolbarExtenderLeft.cs

@@ -0,0 +1,16 @@
+using UnityEditor;
+using UnityToolbarExtender;
+
+namespace TEngine
+{
+    [InitializeOnLoad]
+    public partial class UnityToolbarExtenderLeft
+    {
+        static UnityToolbarExtenderLeft()
+        {
+            ToolbarExtender.LeftToolbarGUI.Add(OnToolbarGUI_SceneLauncher);
+            EditorApplication.playModeStateChanged += OnPlayModeStateChanged;
+            EditorApplication.quitting += OnEditorQuit;
+        }
+    }
+}

UnityProject/Assets/Editor/ToolbarExtender/UnityToolbarExtenderLeft/UnityToolbarExtenderLeft.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: c4485948c7a944af943177214f7f5033
+timeCreated: 1748228552