use formatPrice across codebase

[cm-ayf]

closes: #250

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
comiacapay	Ready	Preview	Comment	Aug 17, 2025 5:45am

[Copilot]

Pull Request Overview

This PR standardizes price formatting across the codebase by implementing a centralized formatPrice utility function that formats Japanese Yen prices consistently.

• Introduces a new formatPrice function in ~/lib/price.ts that uses Intl.NumberFormat for proper currency formatting
• Replaces all manual price formatting patterns throughout the codebase with calls to formatPrice
• Updates test expectations to use the standardized formatting function

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
app/lib/price.ts	Introduces the centralized formatPrice utility function
tests/register.test.ts	Updates test expectations to use formatPrice instead of manual string formatting
tests/receipts.test.ts	Updates test expectations to use formatPrice for consistency
tests/event.test.ts	Updates test expectations to use formatPrice throughout
app/routes/$guildId.$eventId.register._index/route.tsx	Replaces manual price formatting with formatPrice function
app/routes/$guildId.$eventId.receipts._index/Table.tsx	Updates DataGrid value formatter to use formatPrice
app/routes/$guildId.$eventId.receipts._index/Summary.tsx	Replaces complex inline currency formatting with formatPrice
app/routes/$guildId.$eventId._index/route.tsx	Updates discount display logic to use formatPrice
app/components/DisplayPanel.tsx	Replaces manual price formatting with formatPrice in component

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