feat(core): use claude 4 as default chat model (#12596)

Support [AI-59](https://linear.app/affine-design/issue/AI-59)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Updated the default AI model for chat prompts to use Claude Sonnet 4.
- **Bug Fixes**
  - Improved model selection logic to better support reasoning features across more AI models.
- **Tests**
  - Enhanced test cases with consistent instructions for response length.
  - Skipped certain chat-related tests to refine test suite stability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/blocksuite/ai/provider/setup-provider.tsx

@@ -82,7 +82,7 @@ export function setupAIProvider(
 
   //#region actions
   AIProvider.provide('chat', async options => {
-    const { input, contexts, webSearch, reasoning } = options;
+    const { input, contexts, webSearch } = options;
 
     const sessionId = await createSession({
       promptName: 'Chat With AFFiNE AI',
@@ -90,7 +90,7 @@ export function setupAIProvider(
     });
     return textToText({
       ...options,
-      modelId: options.modelId ?? (reasoning ? 'o4-mini' : undefined),
+      modelId: options.modelId,
       client,
       sessionId,
       content: input,