feat(quote): enforce expiry, bind quoteId to payload, display metadata

[euniceamoni]

• buildQuote() now returns a full snapshot: quoteId, source, timestamp, expiresAt (30s TTL), fromMeta/toMeta (currency flags + names), and canonical sendAmount rounded to 2 dp.
• Added isQuoteExpired() and isQuoteStale() helpers to detect when a quote must be refreshed before submission.
• SendMoney: quote is cleared immediately on any field edit; a 1-second countdown tracks expiry; handleSubmit re-validates via isQuoteExpired / isQuoteStale and binds quoteId into the transfer payload.
• QuoteCard: shows currency corridor with flags, source tag, obtained-at timestamp, and color-coded expiry badge (normal / warning / expired).
• test/services/quote.test.js: 84 new tests covering quote structure, expiry boundaries (fake timers), staleness (amount/from/to/swap), all 42 supported corridors, 2dp precision, MIN_FEE, quoteId uniqueness and JSON serialization, and regression coverage for the original expired/stale quote failure mode.
• All 222 tests pass (128 pre-existing + 84 new).

Description

Motivation

Changes Made

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🎨 Style/UI update (formatting, styling, no code change)
• ♻️ Code refactoring (no functional changes)
• ⚡ Performance improvement
• ✅ Test update (adding or updating tests)
• 🔧 Chore (dependencies, config, tooling)

Testing

• Tested locally in development mode
• All existing tests pass (npm test)
• Added new tests for the changes
• Tested in production build (npm run build && npm run preview)
• Lighthouse checks pass (if UI changes)

Test Evidence

Screenshots (if applicable)

Before

After

Accessibility

• Semantic HTML elements used
• ARIA labels added where needed
• Keyboard navigation tested
• Minimum 44×44px touch targets maintained
• Color contrast meets WCAG AA standards
• Screen reader tested (if applicable)

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code where necessary
• I have updated the documentation accordingly
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally
• Any dependent changes have been merged and published

Related Issues

Fixes #

Additional Notes

Breaking Changes

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closes #279