Workflow dark mode improvements

[Devessier]

Dark mode

Old vs New

Light mode

Old vs New

[greptile-apps]

PR Summary

This PR enhances dark mode support in the workflow diagram components by replacing hardcoded colors with theme-aware alternatives for better visual consistency across color schemes.

• Updated WorkflowDiagramCanvasBase.tsx to use theme-aware border color instead of hardcoded GRAY_SCALE.gray25
• Modified WorkflowDiagramBaseStepNode.tsx node type text color to use theme.font.color.light
• Changed selected node background in WorkflowDiagramBaseStepNode.tsx to theme.accent.quaternary
• Improved visual contrast in dark mode while maintaining light mode appearance

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[bosiraphael]

LGTM

[github-actions]

	Fails
🚫	node failed.

Log

�[31mError: �[39m SyntaxError: Unexpected token C in JSON at position 0
    at JSON.parse (<anonymous>)
�[90m    at parseJSONFromBytes (node:internal/deps/undici/undici:5584:19)�[39m
�[90m    at successSteps (node:internal/deps/undici/undici:5555:27)�[39m
�[90m    at fullyReadBody (node:internal/deps/undici/undici:1665:9)�[39m
�[90m    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)�[39m
�[90m    at async specConsumeBody (node:internal/deps/undici/undici:5564:7)�[39m
danger-results://tmp/danger-results-efe7903a.json

Generated by 🚫 dangerJS against cdeb3d7

[HeyGarrison]

This looks amazing - great work!