fix(frontend): Clear button does not work in playground

[ashrafchowdury]

Summary

• Route the playground Clear button through an execution-item clear action that clears generated output and completion-mode testcase input state.
• Reset local completion playground rows to a single empty testcase.
• For connected testsets, remove locally added testcase rows and discard edits while preserving existing connected testcases.

Root Cause

The Clear button only used the run-output clearing path, so completion-mode testcase input rows and edited testcase data could remain in the playground after clearing.

Validation

• pnpm lint-fix
• pnpm --filter @agenta/entities types:check
• pnpm --filter @agenta/playground types:check
• pnpm --filter @agenta/playground-ui types:check
• Commit hook: ruff checks skipped for no Python files, web prettier, turbo lint, and staged gitleaks passed
• Pre-push hook: ruff checks skipped for no Python files, web prettier, turbo lint, staged gitleaks, and diff gitleaks passed

Closes #4185

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Project	Deployment	Actions	Updated (UTC)
agenta-documentation	Ready	Preview, Comment	Apr 21, 2026 0:39am

[github-actions]

Railway Preview Environment

Status	Destroyed (PR closed)

Updated at 2026-04-21T13:32:11.283Z

[ardaerzin]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

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