fix(workflows): surface workflow import failures

[j15z]

Summary

• Show filename-specific error toasts when individual workflow imports fail, including malformed workflow JSON, while continuing other imports.
• Replace raw ZIP extraction errors with “Failed to import ZIP file. Check that it is a valid ZIP archive.”
• Surface folder setup and other import failures, and use stable mutation functions in the import callbacks.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Other: ___________

Testing

• Verified in Chrome: malformed JSON and corrupt ZIP files show the new messages, and the import control recovers.
• Verified in Chrome: a simulated workflow-creation connection failure shows the filename and error; retrying the same valid JSON succeeds and survives reload.
• App type check, repository lint, all 46 audits, block-registry check, and docs-manifest check pass. Generated artifacts are in sync.
• No new automated tests for this UI feedback change.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Screenshots/Videos

Verified both notifications in Chrome. No screenshots attached.

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 12, 2026 8:15pm UTC

[j15z]

@greptile

[j15z]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; the new error paths are correctly scoped and preserve continued importing after individual workflow failures.

Summary

• Reports malformed or otherwise failed workflows with filename-specific error toasts.
• Replaces low-level ZIP loading errors with a clear archive-validation message.
• Surfaces setup-level import failures through the outer error handler.
• Uses stable mutation functions in memoized import callbacks.

_{Reviews (1) · Last reviewed commit: "fix(workflows): clarify invalid import f..."}