## 🚀 Feature: Inline Code Editor

This PR adds a comprehensive inline code editing experience to the
DyadWrite component.

### ✨ What's New

- **Inline Monaco Editor**: Edit code directly within the component
using Monaco Editor
- **Cancel/Revert**: Cancel changes and revert to original code state
- **Language Detection**: Automatic syntax highlighting based on file
extensions
- **Theme Support**: Proper dark/light mode theming integration



https://github.com/user-attachments/assets/c44ab622-6b86-403c-904d-3f327f9719e8


    
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## Summary by cubic
Adds an inline Monaco-based code editor to DyadWrite so users can edit
code blocks in place, then save or cancel changes. Saves stream edits
back to the chat as a dyad-edit block.

- **New Features**
- Inline editor with Edit, Save, and Cancel; preserves original code and
auto-expands when editing.
  - Language detection from file extension and dark/light theme support.
- Save streams edits via useStreamChat as <dyad-edit
path="...">...</dyad-edit> tied to the selected chat.
- Non-edit view still uses CodeHighlight; visibility toggle and
in-progress state respected.

- **Refactors**
- ChatMessage now uses DyadMarkdownParser instead of
VanillaMarkdownParser.

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