feat: #420 Add helper for formatting key price display in XLM with correct decimal places

[jotel-dev]

Summary

Testing

• pnpm lint
• pnpm build

Checklist

• Linked issue or backlog item
• Scope is limited to the stated change
• Updated docs if behavior or setup changed
• Added screenshots for UI changes when relevant

closes #420

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[github-actions]

👋 Hey @jotel-dev, thanks for your contribution!

This PR is targeting main directly. We use main for stable releases only — all contributions should be opened against the dev branch instead.

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