feat(core): support ai recent session history (#13025)

Close [AI-239](https://linear.app/affine-design/issue/AI-239)
Close [AI-240](https://linear.app/affine-design/issue/AI-240)
Close [AI-242](https://linear.app/affine-design/issue/AI-242)

<img width="365" alt="截屏2025-07-04 13 49 25"
src="https://github.com/user-attachments/assets/d7c830f0-cc16-4a26-baf1-480c7d42838f"
/>


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

* **New Features**
* Introduced a floating chat history menu, allowing users to view and
switch between recent AI chat sessions grouped by recency.
* Added a new component for displaying recent chat sessions with
document icons and titles.
* Enhanced chat toolbar with asynchronous confirmation dialogs before
switching or creating sessions.
* Added notification support for chat-related actions and history
clearing.
* Added ability to fetch and display recent AI chat sessions per
workspace.

* **Improvements**
  * Streamlined session management and event handling in the chat panel.
* Improved embedding progress update and context change handling across
chat components.
  * Refined UI for chat history, session switching, and notifications.
* Updated chat components to use direct notification service injection
for better user prompts and toasts.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/desktop/pages/workspace/chat/index.tsx

@@ -195,8 +195,8 @@ export const Component = () => {
         setCurrentSession(null);
         chatContent?.reset();
       };
-      tool.onTogglePin = () => {
-        togglePin().catch(console.error);
+      tool.onTogglePin = async () => {
+        await togglePin();
       };
       // mount
       chatToolContainerRef.current.append(tool);