feat(subflow): start block border

[emir-karabeg]

Summary

Adds a border to the "Subflow Start" block (the small "Start" pill within loop/parallel containers) to ensure visual consistency with the main subflow container and workflow blocks.

Type of Change

• [x] New feature

Testing

The change was verified by running lint and type checks.

Checklist

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

Screenshots/Videos

Before: (Subflow Start block without a border)

After: (Subflow Start block with a border matching the subflow container)

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1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
docs	Skipped		Dec 20, 2025 1:49am