fix(studio): Fix sometimes not being able to select an option on the Code Agent

[htolentino-nvidia]

Summary by CodeRabbit

• New Features

  • The send action in decision flows is now always visible and clearly labeled.
  • Users can no longer submit until required input is provided or a file is selected.

• Bug Fixes

  • Improved disabled-state behavior for send actions to better reflect when a choice is ready to submit.
  • File-based blocking inputs now prevent submission until a dataset file is chosen.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 82e08d7c-c2a8-42a5-9f14-72592a73b249

📥 Commits

Reviewing files that changed from the base of the PR and between 312c2bc and 9dc2e8d.

📒 Files selected for processing (3)

• web/packages/studio/src/components/agents/AgentBlockingInput/FilesetFileBlockingInput.tsx
• web/packages/studio/src/components/agents/AgentDecisionInput/index.test.tsx
• web/packages/studio/src/components/agents/AgentDecisionInput/index.tsx

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📝 Walkthrough

Walkthrough

Agent decision inputs now always show a Send button with input-aware disabled state, and fileset blocking inputs now disable submission until a dataset file is selected. Related tests were updated for the new send-button behavior.

Changes

Agent input submit gating

Layer / File(s)	Summary
Decision send button web/packages/studio/src/components/agents/AgentDecisionInput/index.tsx, web/packages/studio/src/components/agents/AgentDecisionInput/index.test.tsx	AgentDecisionInput now keeps a Send button visible and disables it based on submitting state and trimmed input; the test assertions were updated to match the new button flow.
Dataset file submit gate web/packages/studio/src/components/agents/AgentBlockingInput/FilesetFileBlockingInput.tsx	FilesetFileBlockingInput now watches datasetFile and passes submitDisabled={!datasetFile} to AgentBlockingInputFrame.

Suggested reviewers

• steramae-nvidia
• dmariali

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main fix: users can now select/submit Code Agent options when inputs are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch studio-fix-code-agent-input/htolentino

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[github-actions]

Suite	Lines Covered	Line Rate	Branch Rate
Unit Tests	21322/27924	76.4%	61.4%
Integration Tests	12353/26693	46.3%	19.7%