feat(core): add get session graphql api (#12237)

Close [AI-116](https://linear.app/affine-design/issue/AI-116)

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

- **New Features**
  - Added the ability to retrieve detailed information for a specific Copilot session by its ID, including model metadata and optional models, via the user interface and API.
  - Session data now includes additional fields such as the model used and a list of optional models.
  - Enhanced GraphQL queries and UI components to support fetching and displaying these new session details.

- **Improvements**
  - Session lists now provide richer information, including model details, for each session.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/blocksuite/ai/actions/types.ts

@@ -380,6 +380,10 @@ declare global {
         docId?: string,
         options?: { action?: boolean }
       ) => Promise<CopilotSessionType[] | undefined>;
+      getSession: (
+        workspaceId: string,
+        sessionId: string
+      ) => Promise<CopilotSessionType | undefined>;
       updateSession: (sessionId: string, promptName: string) => Promise<string>;
     }
 

packages/frontend/core/src/blocksuite/ai/provider/copilot-client.ts

@@ -11,6 +11,7 @@ import {
   forkCopilotSessionMutation,
   getCopilotHistoriesQuery,
   getCopilotHistoryIdsQuery,
+  getCopilotSessionQuery,
   getCopilotSessionsQuery,
   type GraphQLQuery,
   listContextObjectQuery,
@@ -136,6 +137,18 @@ export class CopilotClient {
     }
   }
 
+  async getSession(workspaceId: string, sessionId: string) {
+    try {
+      const res = await this.gql({
+        query: getCopilotSessionQuery,
+        variables: { sessionId, workspaceId },
+      });
+      return res.currentUser?.copilot?.session;
+    } catch (err) {
+      throw resolveError(err);
+    }
+  }
+
   async getSessions(
     workspaceId: string,
     docId?: string,

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

@@ -579,6 +579,9 @@ Could you make a new website based on these notes and send back just the html fi
 
   AIProvider.provide('session', {
     createSession,
+    getSession: async (workspaceId: string, sessionId: string) => {
+      return client.getSession(workspaceId, sessionId);
+    },
     getSessions: async (
       workspaceId: string,
       docId?: string,