feat: make PayArc and Mollie icons square brand marks

[kilbot]

Summary

Follow-up to #17/#18. The PayArc and Mollie icons were wordmarks, which looked out of place next to the other catalog icons — those are square symbol marks (square.svg, paypal.svg, etc.). This makes both consistent.

• icons/payarc.svg — blue (#3763AF) rounded-square tile + white "P", matching PayArc's app-icon mark.
• icons/mollie.svg — black (#111) rounded-square tile + white "m", matching Mollie's app-icon mark.

Both use the same rounded-square tile geometry as icons/square.svg (viewBox 0 0 100 100), so they sit uniformly with the rest of the catalog.

Filenames unchanged → catalog.json icon URLs already resolve, no catalog edit needed.

Validation

• Both SVGs rendered and visually verified against the vendors' brand marks.
• Square tile geometry matches the existing square.svg house style.

🤖 Generated with Claude Code

[coderabbitai]

Important

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• icons/mollie.svg is excluded by !**/*.svg
• icons/payarc.svg is excluded by !**/*.svg

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/square-brand-icons

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