fix: capture detailed error response body for reranker API failures (#10839)

* fix: capture detailed error response body for reranker API failures

Previously, when reranker API returned 400 or other error status codes,
only the HTTP status and status text were captured, without reading the
actual error response body that contains detailed error information.

This commit fixes the issue by:
- Reading the error response body (as JSON or text) before throwing error
- Attaching the response details to the error object
- Including responseBody in formatErrorMessage output

This will help diagnose issues like "qwen3-reranker not available" by
showing the actual error message from the API provider.

* fix: enhance error handling in GeneralReranker for API failures

This update improves the error handling in the GeneralReranker class by ensuring that the response body is properly cloned and read when an API call fails. The detailed error information, including the status, status text, and body, is now attached to the error object. This change aids in diagnosing issues by providing more context in error messages.

src/main/knowledge/reranker/BaseReranker.ts

@@ -80,6 +80,7 @@ export default abstract class BaseReranker {
       message: error.message,
       status: error.response?.status,
       statusText: error.response?.statusText,
+      responseBody: error.response?.body, // Include the actual API error response
       requestBody: requestBody
     }
     return JSON.stringify(errorDetails, null, 2)

src/main/knowledge/reranker/GeneralReranker.ts

@@ -2,6 +2,15 @@ import { KnowledgeBaseParams, KnowledgeSearchResult } from '@types'
 import { net } from 'electron'
 
 import BaseReranker from './BaseReranker'
+
+interface RerankError extends Error {
+  response?: {
+    status: number
+    statusText: string
+    body?: unknown
+  }
+}
+
 export default class GeneralReranker extends BaseReranker {
   constructor(base: KnowledgeBaseParams) {
     super(base)
@@ -17,7 +26,30 @@ export default class GeneralReranker extends BaseReranker {
       })
 
       if (!response.ok) {
-        throw new Error(`HTTP ${response.status}: ${response.statusText}`)
+        // Read the response body to get detailed error information
+        // Clone the response to avoid consuming the body multiple times
+        const clonedResponse = response.clone()
+        let errorBody: unknown
+
+        try {
+          errorBody = await clonedResponse.json()
+        } catch {
+          // If response body is not JSON, try to read as text
+          try {
+            errorBody = await response.text()
+          } catch {
+            errorBody = null
+          }
+        }
+
+        const error = new Error(`HTTP ${response.status}: ${response.statusText}`) as RerankError
+        // Attach response details to the error object for formatErrorMessage
+        error.response = {
+          status: response.status,
+          statusText: response.statusText,
+          body: errorBody
+        }
+        throw error
       }
 
       const data = await response.json()