feat(agents): add GPT-4.1 models and expandable collections

- Add GPT-4.1 and GPT-4.1-mini to OpenAI provider models
- Set gpt-4.1-mini as default model for new agents
- Make collections in chat tools panel expandable/clickable
- Fix type error in ChatToolsPanel

apps/web/src/app/dashboard/agents/new/page.tsx

@@ -42,7 +42,7 @@ export default function NewAgentPage(): React.ReactElement {
     uid: '',
     description: '',
     provider: 'OPENAI',
-    modelId: 'gpt-4o',
+    modelId: 'gpt-4.1-mini',
     systemPrompt: '',
     temperature: 0.7,
     maxToolCallsPerTurn: 20,