Remove blocks as model and switch automatically (#504)

ai/models.ts

@@ -20,12 +20,6 @@ export const models: Array<Model> = [
     apiIdentifier: 'gpt-4o',
     description: 'For complex, multi-step tasks',
   },
-  {
-    id: 'gpt-4o-blocks',
-    label: 'GPT 4o with Blocks',
-    apiIdentifier: 'gpt-4o',
-    description: 'Collaborate with writing',
-  },
 ] as const;
 
 export const DEFAULT_MODEL_NAME: string = 'gpt-4o-mini';

ai/prompts.ts

@@ -9,7 +9,6 @@ export const blocksPrompt = `
   - When explicitly requested to create a document
 
   **When NOT to use \`createDocument\`:**
-  - For short content (<10 lines)
   - For informational/explanatory content
   - For conversational responses
   - When asked to keep it in chat
@@ -24,3 +23,5 @@ export const blocksPrompt = `
 
 export const regularPrompt =
   'You are a friendly assistant! Keep your responses concise and helpful.';
+
+export const systemPrompt = `${regularPrompt}\n\n${blocksPrompt}`;