feat(core): add ai tool call error type and ui (#12941)

<img width="775" alt="截屏2025-06-26 16 17 05"
src="https://github.com/user-attachments/assets/ed6bcae3-94af-4eb1-81e8-710f36ef5e46"
/>


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

## Summary by CodeRabbit

* **New Features**
  * Introduced a tool to crawl web pages and extract key information.
* Added a visual component to display tool call failures in the AI
interface.
* Enhanced error reporting for document and web search tools with
structured error messages.

* **Improvements**
* Updated error handling across AI tools and components for more
consistent and informative feedback.
* Default values added for tool card components to improve reliability
and display.

* **Bug Fixes**
* Improved handling of error and empty states in web crawl and web
search result displays.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/plugins/copilot/providers/utils.ts

@@ -390,19 +390,19 @@ export interface CustomAITools extends ToolSet {
 
 type ChunkType = TextStreamPart<CustomAITools>['type'];
 
-export function parseUnknownError(error: unknown) {
+export function toError(error: unknown): Error {
   if (typeof error === 'string') {
-    throw new Error(error);
+    return new Error(error);
   } else if (error instanceof Error) {
-    throw error;
+    return error;
   } else if (
     typeof error === 'object' &&
     error !== null &&
     'message' in error
   ) {
-    throw new Error(String(error.message));
+    return new Error(String(error.message));
   } else {
-    throw new Error(JSON.stringify(error));
+    return new Error(JSON.stringify(error));
   }
 }
 
@@ -483,8 +483,7 @@ export class TextStreamParser {
         break;
       }
       case 'error': {
-        parseUnknownError(chunk.error);
-        break;
+        throw toError(chunk.error);
       }
     }
     this.lastType = chunk.type;
@@ -550,8 +549,7 @@ export class StreamObjectParser {
         return chunk;
       }
       case 'error': {
-        parseUnknownError(chunk.error);
-        return null;
+        throw toError(chunk.error);
       }
       default: {
         return null;