Switch the local inference provider MLX backend to use the safemlx crate (#10304)

ui/desktop/src/utils/conversionUtils.ts

@@ -13,6 +13,11 @@ export async function safeJsonParse<T>(
 }
 
 export function errorMessage(err: Error | unknown, default_value?: string) {
+  const acpData = acpErrorData(err);
+  if (typeof acpData === 'string') {
+    return acpData;
+  }
+
   if (err instanceof Error) {
     return err.message;
   } else if (typeof err === 'object' && err !== null && 'message' in err) {
@@ -22,6 +27,19 @@ export function errorMessage(err: Error | unknown, default_value?: string) {
   }
 }
 
+function acpErrorData(err: unknown): unknown {
+  if (typeof err !== 'object' || err === null) {
+    return undefined;
+  }
+
+  const candidate = 'error' in err && isRecord(err.error) ? err.error : err;
+  return isRecord(candidate) ? candidate.data : undefined;
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === 'object' && value !== null;
+}
+
 export function formatErrorForLogging(error: unknown): string {
   if (error instanceof Error) {
     return `${error.name}: ${error.message}${error.stack ? `\n${error.stack}` : ''}`;