fix(workflows): preserve contrast on gradient tiles

[waleedlatif1]

Summary

• detect brightness from supported CSS gradient color stops for tile foreground contrast
• share the gradient-specific heuristic between app and workflow renderer tile detectors

Type of Change

• Bug fix

Testing

• 21 focused Vitest tests
• app, workflow renderer, and utility type checks
• repo lint, block registry audit, and all 40 repo audits

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)

[vercel]

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 1, 2026 2:32am UTC

[greptile-apps]

Greptile Summary

The PR extends the shared tile-contrast heuristic to derive foreground contrast from supported CSS gradient stops.

• Adds solid-color and gradient background brightness parsing to @sim/utils/color.
• Uses the shared gradient-aware heuristic in the application and workflow renderer.
• Adds focused tests for light, dark, mixed, and unsupported gradients.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
packages/utils/src/color.ts	Adds validated parsing and average brightness calculation for supported static CSS gradients.
apps/sim/blocks/icon-color.ts	Replaces the app-specific solid-color check with the shared gradient-aware brightness helper.
packages/workflow-renderer/src/lib/tile-icon-color.ts	Updates workflow tiles to use the same gradient-aware foreground contrast heuristic.

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[cubic-dev-ai]

All reported issues were addressed across 6 files

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[waleedlatif1]

@greptile