feat: added the artifect download button, and revamp artifect library

[krishna9358]

Summary

1. Currently the artifact's row doesn't help. We should display the following:

• Workflow name .
• Link to run from which the artifact was generated.
• Actions should have 'Download' and 'Delete' icon. and left align 'Actions' in the column.
• Remove the 'Copy ID' button. serves no purpose.
• Remove the 'COMPONENT' column.

2. Artifact Download Button Fix (Backend)
   Issue: Download buttons in the Run Artifacts Panel weren't working.

Root Cause: The backend URL path used {artifactId} but the DTO schema expected
id, causing a parameter mismatch.

Files Changed:

backend/src/storage/dto/artifacts.dto.ts

• Added new RunArtifactIdParamSchema and RunArtifactIdParamDto
  that uses artifactId as the property name
  backend/src/workflows/workflows.controller.ts
• Updated to use the new DTO and fixed the import to remove unused types
  frontend/src/services/api.ts
• Changed
  downloadArtifact
  to use direct fetch with manually constructed URL (bypassing the typed client with the OpenAPI spec bug)

3. Blank Canvas When Navigating From Artifact Library (Frontend)
   Issue: Clicking run links in the Artifact Library opened the workflow page with a blank canvas; only refreshing showed the graph.

Root Cause: When navigating directly to a run URL, the execution graph wasn't being initialized because the code was skipping initialization when there was a run context.

Files Changed:

frontend/src/features/workflow-builder/WorkflowBuilder.tsx

• Changed logic to always initialize execution nodes when they're empty, regardless of run context
  frontend/src/features/workflow-builder/hooks/useWorkflowExecutionLifecycle.ts
• Added safety checks to avoid hydrating from empty design state

4. Added delete functionality to delete the artifacts.

Testing

• bun run test
• bun run lint
• bun run typecheck
• Additional notes:

Documentation

• Updated the relevant doc(s) (see docs/guide.md) or checked that no updates are needed.
• Recorded contract/architecture changes in both public docs and .ai logs when applicable.

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