[flashdeed05-ai]

Adds the computed NAV of an invoice against its current market price, so an investor can see whether the market is paying a premium or a discount.

• lib/nav.ts: the pricing rules as pure helpers — where the price sits relative to NAV, the gap in basis points, and when a NAV is stale.
• lib/api: fetchInvoiceNav reads GET /invoices/:id/nav and normalises the field spellings the endpoint has shipped. A 404 is "no NAV", not an error, so an unpriced invoice hides the chip instead of failing.
• NavChip on the marketplace card and list row, and InvoiceNavPanel in the invest panel on the invoice detail page.
• The chip and panel render nothing when an invoice has no NAV, and warn once the NAV is more than an hour old.

Also fixes a pre-existing type error in FeeTierDisplay that was failing tsc --noEmit on dev, and with it the last merged CI run.

Close #546
Close #548
Close #550
Close #549

Description

Closes #

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🎨 UI/UX improvement
• ♻️ Code refactoring
• ✅ Test addition or update
• 🔧 Configuration change

Checklist

• My code follows the code style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Testing

How to Test

1. Step one
2. Step two
3. Step three

Test Coverage

• Unit tests added/updated
• Integration tests added/updated
• E2E tests added/updated (if applicable)
• Manual testing completed

Screenshots (if applicable)

Additional Notes

For Reviewers

• Code quality and readability
• Test coverage
• Security implications
• Performance impact
• Breaking changes

[drips-wave]

@flashdeed05-ai Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits