feat: Update plugin manager integration with lucide-react icons and improve RoomInput component logic

src/app/features/settings/plugins/PLUGIN_DEVELOPMENT.md

@@ -149,6 +149,16 @@ interface MessageContext {
 
 ### 🎨 UI API
 
+Plugins also receive `ctx.lucide` — the full [lucide-react](https://lucide.dev/) icon set for custom renderers and UI.
+
+```javascript
+const { Link, Search, X } = ctx.lucide;
+
+ctx.ui.registerRenderer('message', (msg, defaultRenderer) => {
+  return ctx.React.createElement(Link, { size: 16 });
+});
+```
+
 Register custom renderers:
 
 ```javascript