[browser-use] Bug: ChatGoogle does not repair an action list Gemini returns as a JSON string, so the step fails validation and retries

## Observed symptom Bug: ChatGoogle does not repair an action list Gemini returns as a JSON string, so the step fails validation and retries <!-- prilog-copy-issue:5586688301 --> Copied for testing from https://github.com/browser-use/browser-use/issues/5914 ## Environment GitHub Roshan931/browser-use #4 ## Trigger / context Public GitHub report in Roshan931/browser-use (FRESH_7D). ## Source evidence - https://github.com/Roshan931/browser-use/issues/4 (2026-09-29T21:15:47Z) — evidence_class: PRIMARY_ISSUE_REPORT — #4 ## Freshness - classification: FRESH_7D - retrieved_at: 2026-10-02T10:47:55.298020Z - scout_id: Cc2b5ab9a8d ## Scout notes This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome. Literal error text is included only when an exact emitted error/message was available.