fix(resp-format): add UI warning for invalid json in response format

[icecrasher321]

Description

Add realtime UI warning if invalid json in response format field.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Screen.Recording.2025-07-10.at.11.50.42.AM.mov

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• All tests pass locally and in CI (bun run test)
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• I have updated version numbers as needed (if needed)
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Security Considerations:

• My changes do not introduce any new security vulnerabilities
• I have considered the security implications of my changes

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
sim	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 10, 2025 8:24pm

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Skipped (Inspect)			Jul 10, 2025 8:24pm

[delve-auditor]

✅ No security or compliance issues detected. Reviewed everything up to a0a4b21.

Security Overview

• 🔎 Scanned files: 3 changed file(s)

Detected Code Changes

Change Type	Relevant files
Enhancement	► code.tsx     Add JSON validation for response format ► sub-block.tsx     Add JSON validation UI elements ► agent-handler.ts     Improve response format handling
Documentation	► function.mdx     Update output format and descriptions ► response.mdx     Update response fields documentation ► Multiple tool .mdx files     Standardize output format documentation

Reply to this PR with @delve-auditor followed by a description of what change you want and we'll auto-submit a change to this PR to implement it.

[greptile-apps]

PR Summary

Enhances JSON handling with robust parsing and UI feedback for response formats in workflow blocks.

• Added real-time JSON validation in apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/workflow-block/components/sub-block/sub-block.tsx with visual AlertTriangle indicator and tooltip
• Implemented multi-strategy JSON parsing in apps/sim/executor/handlers/agent/agent-handler.ts including markdown code block extraction and bracket matching
• Added visual feedback in Code component with red border/background styling for invalid JSON states
• Improved error handling by adding informative warnings instead of silent failures during JSON parsing

_{3 files reviewed, 2 comments
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