feat(server): improve context metadata & matching (#12064)

fix AI-20

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

- **New Features**
  - Enhanced file metadata with MIME type, blob ID, and file name across context and workspace, now visible in UI and API.
  - Added workspace-level matching for files and documents with configurable thresholds and workspace scoping in search queries.
  - Introduced a new error type and user-friendly messaging for global workspace context matching failures.

- **Bug Fixes**
  - Improved consistent handling of file MIME types and nullable context IDs for accurate metadata.

- **Documentation**
  - Updated GraphQL schema, queries, and mutations to include new metadata fields, optional parameters, and error types.

- **Style**
  - Added new localization strings for global context matching error messages.

- **Tests**
  - Extended test coverage with new and updated snapshot tests for metadata and matching logic.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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

@@ -329,9 +329,12 @@ declare global {
         abortSignal: AbortSignal
       ) => Promise<void>;
       matchContext: (
-        contextId: string,
         content: string,
-        limit?: number
+        contextId?: string,
+        workspaceId?: string,
+        limit?: number,
+        scopedThreshold?: number,
+        threshold?: number
       ) => Promise<{
         files?: ContextMatchedFileChunk[];
         docs?: ContextMatchedDocChunk[];

packages/frontend/core/src/blocksuite/ai/components/ai-chat-input/ai-chat-input.ts

@@ -661,7 +661,7 @@ export class AIChatInput extends SignalWatcher(WithDisposable(LitElement)) {
     >();
 
     const { files: matchedFiles = [], docs: matchedDocs = [] } =
-      (await AIProvider.context?.matchContext(contextId, userInput)) ?? {};
+      (await AIProvider.context?.matchContext(userInput, contextId)) ?? {};
 
     matchedDocs.forEach(doc => {
       docContexts.set(doc.docId, {

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

@@ -241,7 +241,7 @@ export class CopilotClient {
         sessionId,
       },
     });
-    return res.currentUser?.copilot?.contexts?.[0]?.id;
+    return res.currentUser?.copilot?.contexts?.[0]?.id || undefined;
   }
 
   async addContextDoc(options: OptionsField<typeof addContextDocMutation>) {
@@ -333,13 +333,23 @@ export class CopilotClient {
     return res.currentUser?.copilot?.contexts?.[0];
   }
 
-  async matchContext(contextId: string, content: string, limit?: number) {
+  async matchContext(
+    content: string,
+    contextId?: string,
+    workspaceId?: string,
+    limit?: number,
+    scopedThreshold?: number,
+    threshold?: number
+  ) {
     const res = await this.gql({
       query: matchContextQuery,
       variables: {
-        contextId,
         content,
+        contextId,
+        workspaceId,
         limit,
+        scopedThreshold,
+        threshold,
       },
     });
     const { matchFiles: files, matchWorkspaceDocs: docs } =

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

@@ -700,11 +700,21 @@ Could you make a new website based on these notes and send back just the html fi
       }
     },
     matchContext: async (
-      contextId: string,
       content: string,
-      limit?: number
+      contextId?: string,
+      workspaceId?: string,
+      limit?: number,
+      scopedThreshold?: number,
+      threshold?: number
     ) => {
-      return client.matchContext(contextId, content, limit);
+      return client.matchContext(
+        content,
+        contextId,
+        workspaceId,
+        limit,
+        scopedThreshold,
+        threshold
+      );
     },
   });