Add implementation summary for IDE-style code block rendering

IDE_CODE_BLOCK_SUMMARY.md

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+# 🎨 IDE-Style Code Block Rendering - Implementation Summary
+
+## ✅ What We Built
+
+Added beautiful IDE-style syntax highlighting for code blocks pasted into the Goose chat input!
+
+## 🚀 Features
+
+### 1. **Code Block Detection**
+- Automatically detects triple backtick code fences: ` ```language\ncode\n``` `
+- Regex pattern: `/```(\w+)?\n([\s\S]*?)```/g`
+- Extracts language identifier (optional) and code content
+
+### 2. **Syntax Highlighting**
+- Uses `react-syntax-highlighter` with Prism
+- VS Code Dark Plus theme (`vscDarkPlus`)
+- Supports all major programming languages:
+  - JavaScript/TypeScript
+  - Python
+  - Java, C++, C#, Go, Rust
+  - HTML, CSS, JSON, YAML
+  - SQL, Bash, PowerShell
+  - And many more!
+
+### 3. **Visual Design**
+- **Dark IDE-like appearance** with `#1E1E1E` background
+- **Language badge** in top-right corner (e.g., "typescript", "python")
+- **Rounded corners** and subtle border
+- **Monospace font** for code
+- **Proper padding** and spacing
+
+### 4. **Integration**
+- Seamlessly integrated with existing features:
+  - ✅ Action pills `[Action]`
+  - ✅ Mention pills `@filename`
+  - ✅ Spell checking (code blocks excluded)
+  - ✅ Cursor positioning
+  - ✅ Height synchronization
+
+## 📝 Usage
+
+Simply paste code with triple backticks:
+
+\`\`\`typescript
+function greet(name: string): string {
+  return \`Hello, \${name}!\`;
+}
+\`\`\`
+
+Or without language (defaults to plain text):
+
+\`\`\`
+Some plain text code
+\`\`\`
+
+## 🔧 Technical Implementation
+
+### Files Modified
+- `ui/desktop/src/components/RichChatInput.tsx`
+
+### Key Changes
+
+1. **Import Syntax Highlighter** (Line ~7):
+```typescript
+import { Prism as SyntaxHighlighter } from 'react-syntax-highlighter';
+import { vscDarkPlus } from 'react-syntax-highlighter/dist/esm/styles/prism';
+```
+
+2. **Code Block Detection** (Line ~587):
+```typescript
+const codeBlockRegex = /```(\w+)?\n([\s\S]*?)```/g;
+let codeBlockMatch;
+codeBlockRegex.lastIndex = 0;
+while ((codeBlockMatch = codeBlockRegex.exec(value)) !== null) {
+  const language = codeBlockMatch[1] || 'text';
+  const code = codeBlockMatch[2];
+  allMatches.push({
+    type: 'codeblock',
+    match: codeBlockMatch,
+    index: codeBlockMatch.index,
+    length: codeBlockMatch[0].length,
+    content: code,
+    language: language
+  });
+}
+```
+
+3. **Code Block Rendering** (Line ~730):
+```typescript
+} else if (type === 'codeblock') {
+  const language = (matchData as any).language || 'text';
+  const code = content;
+  
+  parts.push(
+    <div key={`codeblock-${keyCounter++}`} className="block my-2" style={{ pointerEvents: 'auto' }}>
+      <div className="relative rounded-lg overflow-hidden bg-[#1E1E1E] border border-gray-700">
+        {/* Language badge */}
+        {language && language !== 'text' && (
+          <div className="absolute top-2 right-2 px-2 py-1 text-xs font-mono text-gray-300 bg-gray-800/80 rounded">
+            {language}
+          </div>
+        )}
+        {/* Syntax highlighted code */}
+        <SyntaxHighlighter
+          language={language}
+          style={vscDarkPlus}
+          customStyle={{
+            margin: 0,
+            padding: '16px',
+            background: 'transparent',
+            fontSize: '0.875rem',
+            lineHeight: '1.5',
+          }}
+          codeTagProps={{
+            style: {
+              fontFamily: 'Monaco, Menlo, "Ubuntu Mono", Consolas, source-code-pro, monospace',
+            }
+          }}
+        >
+          {code}
+        </SyntaxHighlighter>
+      </div>
+    </div>
+  );
+}
+```
+
+## 🎯 Benefits
+
+1. **Better Code Readability** - Syntax highlighting makes code much easier to read
+2. **Professional Appearance** - IDE-like styling looks polished and modern
+3. **Language Awareness** - Automatically detects and highlights based on language
+4. **Seamless Integration** - Works perfectly with all existing chat input features
+5. **No Breaking Changes** - All existing functionality preserved
+
+## 🧪 Testing
+
+To test, simply paste code into the chat input:
+
+**Example 1 - TypeScript:**
+```typescript
+interface User {
+  name: string;
+  age: number;
+}
+
+const greet = (user: User) => {
+  console.log(`Hello, ${user.name}!`);
+};
+```
+
+**Example 2 - Python:**
+```python
+def fibonacci(n):
+    if n <= 1:
+        return n
+    return fibonacci(n-1) + fibonacci(n-2)
+
+print(fibonacci(10))
+```
+
+**Example 3 - JavaScript:**
+```javascript
+const fetchData = async (url) => {
+  try {
+    const response = await fetch(url);
+    return await response.json();
+  } catch (error) {
+    console.error('Error:', error);
+  }
+};
+```
+
+## 📊 Commit History
+
+```
+02b38f3 - Add IDE-style syntax highlighting for code blocks in chat input
+```
+
+## 🚀 Next Steps (Future Enhancements)
+
+1. **Copy Button** - Add a copy-to-clipboard button in the top-right
+2. **Line Numbers** - Optional line number display
+3. **Theme Toggle** - Switch between light/dark code themes
+4. **Collapsible Blocks** - For very long code snippets
+5. **Code Execution** - Run code snippets directly (for safe languages)
+
+## 🎉 Result
+
+The chat input now provides a beautiful, IDE-quality code viewing experience that makes sharing and discussing code much more pleasant!
+
+---
+
+**Branch**: `spence/textinput-experiment`  
+**Status**: ✅ Complete and Ready for Testing