fix(olostep): preserve plain-text error bodies and strengthen malformed JSON test

- Include json.raw fallback in makeRequest error extraction so non-JSON
  error responses from the API are surfaced rather than falling back to
  the generic HTTP status message
- Strengthen malformed-JSON test to assert res.success is true (not just
  res.data.operation) so regressions in the graceful fallback path are caught

Author: ZeeshanAdilButt

packages/bubble-core/src/bubbles/service-bubble/olostep.test.ts

@@ -415,8 +415,9 @@ describe('OlostepBubble', () => {
 
       const res = await bubble.action();
 
-      // Implementation gracefully handles malformed JSON by returning raw text
+      // Graceful fallback: parses raw text, returns success with raw content
       expect(res.data.operation).toBe('scrape');
+      expect(res.success).toBe(true);
     });
 
     it('should handle missing credentials gracefully', async () => {

packages/bubble-core/src/bubbles/service-bubble/olostep.ts

@@ -566,7 +566,9 @@ export class OlostepBubble extends ServiceBubble<OlostepParams, OlostepResult> {
       const errorMessage =
         typeof json?.error === 'string'
           ? json.error
-          : json?.error?.message || json?.message;
+          : json?.error?.message ||
+            json?.message ||
+            (typeof json?.raw === 'string' ? json.raw : undefined);
       throw new Error(errorMessage || `HTTP ${response.status}`);
     }