Start on new sidebar (#456)

Co-authored-by: shadcn <m@shadcn.com>

lib/model.ts

@@ -0,0 +1,17 @@
+// Define your models here.
+export const models = [
+  {
+    label: 'GPT 4o',
+    name: 'gpt-4o',
+    description: 'For complex, multi-step tasks',
+  },
+  {
+    label: 'GPT 4o mini',
+    name: 'gpt-4o-mini',
+    description: 'Small model for fast, lightweight tasks',
+  },
+] as const;
+
+export const DEFAULT_MODEL_NAME: Model['name'] = 'gpt-4o';
+
+export type Model = (typeof models)[number];