feat(ui): modernize editor UI with monochrome design system

.github/instructions/code-review.instructions.md

@@ -36,6 +36,13 @@ For state accessed across Unity callbacks:
 - Hot update: `HotUpdate.Code`
 - **Exception**: `Assets/Scripts/` may contain user-level code without namespace (intentional for user customization)
 
+### 6. Performance Patterns
+Avoid LINQ in hot paths and UI code for performance:
+- Use `for`/`foreach` loops with inline null checks instead of `.Where()`
+- Use `Count > 0` or `Length > 0` instead of `.Any()`
+- Use array/list indexing instead of `.First()` / `.Last()`
+- LINQ allocates iterators and delegates - avoid in frequently called code
+
 ## Common Issues to Flag
 
 - Missing XML documentation on public APIs

UnityProject/Packages/com.jasonxudeveloper.jengine.core/Editor/BuildHelper.cs

@@ -0,0 +1,152 @@
+// BuildHelper.cs
+//
+//  Author:
+//        JasonXuDeveloper <[email protected]>
+//
+//  Copyright (c) 2025 JEngine
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+using System;
+using JEngine.Core.Editor.CustomEditor;
+using UnityEditor;
+
+namespace JEngine.Core.Editor
+{
+    /// <summary>
+    /// Helper class for build operations with UI update callbacks.
+    /// </summary>
+    public static class BuildHelper
+    {
+        /// <summary>
+        /// Callbacks for build UI updates.
+        /// </summary>
+        public class BuildCallbacks
+        {
+            /// <summary>
+            /// Called to enable/disable build buttons.
+            /// </summary>
+            public Action<bool> SetButtonsEnabled { get; set; }
+
+            /// <summary>
+            /// Called to clear the log view.
+            /// </summary>
+            public Action ClearLog { get; set; }
+
+            /// <summary>
+            /// Called to update status text.
+            /// </summary>
+            public Action<string> UpdateStatus { get; set; }
+
+            /// <summary>
+            /// Called when build completes successfully.
+            /// </summary>
+            public Action OnSuccess { get; set; }
+
+            /// <summary>
+            /// Called when build fails.
+            /// </summary>
+            public Action OnError { get; set; }
+        }
+
+        /// <summary>
+        /// Executes BuildAll with standard UI callbacks.
+        /// </summary>
+        public static void ExecuteBuildAll(BuildManager buildManager, BuildCallbacks callbacks)
+        {
+            if (buildManager.IsBuilding) return;
+
+            callbacks.SetButtonsEnabled?.Invoke(false);
+            callbacks.ClearLog?.Invoke();
+
+            buildManager.StartBuildAll(
+                onComplete: () =>
+                {
+                    callbacks.SetButtonsEnabled?.Invoke(true);
+                    callbacks.UpdateStatus?.Invoke("Build completed");
+                    callbacks.OnSuccess?.Invoke();
+                    EditorUtility.DisplayDialog("Build Successful", "Build completed successfully!", "OK");
+                },
+                onError: e =>
+                {
+                    callbacks.SetButtonsEnabled?.Invoke(true);
+                    callbacks.UpdateStatus?.Invoke("Build failed");
+                    callbacks.OnError?.Invoke();
+                    EditorUtility.DisplayDialog("Build Failed", $"Build failed with error:\n{e.Message}", "OK");
+                }
+            );
+        }
+
+        /// <summary>
+        /// Executes BuildCodeOnly with standard UI callbacks.
+        /// </summary>
+        public static void ExecuteBuildCodeOnly(BuildManager buildManager, BuildCallbacks callbacks)
+        {
+            if (buildManager.IsBuilding) return;
+
+            callbacks.SetButtonsEnabled?.Invoke(false);
+            callbacks.ClearLog?.Invoke();
+
+            buildManager.StartBuildCodeOnly(
+                onComplete: () =>
+                {
+                    callbacks.SetButtonsEnabled?.Invoke(true);
+                    callbacks.UpdateStatus?.Invoke("Code build completed");
+                    callbacks.OnSuccess?.Invoke();
+                    EditorUtility.DisplayDialog("Code Build Successful", "Code build completed successfully!", "OK");
+                },
+                onError: e =>
+                {
+                    callbacks.SetButtonsEnabled?.Invoke(true);
+                    callbacks.UpdateStatus?.Invoke("Code build failed");
+                    callbacks.OnError?.Invoke();
+                    EditorUtility.DisplayDialog("Code Build Failed", $"Code build failed with error:\n{e.Message}", "OK");
+                }
+            );
+        }
+
+        /// <summary>
+        /// Executes BuildAssetsOnly with standard UI callbacks.
+        /// </summary>
+        public static void ExecuteBuildAssetsOnly(BuildManager buildManager, BuildCallbacks callbacks)
+        {
+            if (buildManager.IsBuilding) return;
+
+            callbacks.SetButtonsEnabled?.Invoke(false);
+            callbacks.ClearLog?.Invoke();
+
+            buildManager.StartBuildAssetsOnly(
+                onComplete: () =>
+                {
+                    callbacks.SetButtonsEnabled?.Invoke(true);
+                    callbacks.UpdateStatus?.Invoke("Assets build completed");
+                    callbacks.OnSuccess?.Invoke();
+                    EditorUtility.DisplayDialog("Assets Build Successful", "Assets build completed successfully!", "OK");
+                },
+                onError: e =>
+                {
+                    callbacks.SetButtonsEnabled?.Invoke(true);
+                    callbacks.UpdateStatus?.Invoke("Assets build failed");
+                    callbacks.OnError?.Invoke();
+                    EditorUtility.DisplayDialog("Assets Build Failed", $"Assets build failed with error:\n{e.Message}", "OK");
+                }
+            );
+        }
+    }
+}