add theme builder tip

tips/theme-builder-customize.mdx

@@ -0,0 +1,33 @@
+---
+title: Build Custom Themes with Theme Builder
+subtitle: Create and customize your perfect Zed theme visually
+category: config
+difficulty: beginner
+tags:
+  - themes
+  - customization
+  - ui
+mediaType: image
+mediaUrl: 'https://cat.zed.tips/2026-01-29/zed-theme-builder.png'
+publishedAt: '2026-01-29'
+updatedAt: '2026-01-29'
+author: godruoyi
+authorUrl: 'https://github.com/godruoyi'
+---
+
+Zed's official **Theme Builder** lets you create and customize themes visually without writing any code. Whether you want to tweak an existing theme or build one from scratch, the Theme Builder makes it easy.
+
+## Getting Started
+
+1. Visit [zed.dev/theme-builder](https://zed.dev/theme-builder)
+2. Choose a base theme to start from, or begin with a blank canvas
+3. Customize colors using the visual editor
+4. Preview your changes in real-time
+
+## Key Features
+
+**Visual Color Picker**: Click on any UI element to customize its color. No need to remember JSON structure or color codes.
+
+**Real-time Preview**: See your changes instantly in a live Zed editor preview, showing how your theme looks with actual code.
+
+**Export & Share**: When you're done, export your theme as a JSON file or share it with the community.