Invoice Expiry Countdown Banner with Snooze

[Kingsman-99]

Description

Invoices approaching their due date provide no proactive visual urgency to the payer or creator; the due date is a static field. This issue adds a dynamic expiry countdown banner on both the creator's /invoice/[id] view and the public payer page that shows a live countdown (days, hours, minutes) when the invoice is within 72 hours of its due date, transitions to a red "Overdue" state after the due date passes, and provides a snooze action that suppresses the banner for a configurable duration without modifying the invoice's actual due date.

Technical Context

Create components/invoice/ExpiryCountdownBanner.tsx that receives dueDate: string and computes time remaining using Date.now() inside a setInterval updating every minute. Display { days, hours, minutes } using a countdown format. Apply color transitions: amber for 72 hours or fewer remaining, red for overdue. The snooze action stores { invoiceId, snoozedUntil } in localStorage and suppresses the banner until snoozedUntil. The snooze duration options are: 1 hour, 4 hours, until tomorrow. On the creator side, wire the banner into app/invoice/[id]/page.tsx above the invoice header. On the public page (/pay/[invoiceId]), the same component is rendered but without the snooze option; payers always see the live countdown. Clear snooze state when the invoice is paid.

Acceptance Criteria

• The banner appears automatically when the due date is within 72 hours, showing a live countdown that decrements every minute
• The countdown transitions to a red "Overdue by [duration]" display immediately after the due date passes without requiring a page refresh
• Selecting "Snooze for 1 hour" hides the banner and persists the snooze in localStorage; returning to the page within the snooze window keeps the banner hidden
• After the snooze duration elapses, the banner reappears on the next minute tick
• The snooze option is absent from the public payer page; payers always see the live countdown without the snooze control
• All CI checks (npm test, npm run build, ESLint/TypeScript) pass and the branch has no merge conflicts

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[ebubeb683-ship-it]

Hello boss, Please assign this issue to me. i checked it out and im confident i will solve it
my eta is 4 hours