Add unit tests for `formatCurrency` and `formatRelativeTime` in lib/utils

[aruneshwisdm]

Summary

The core utility functions in apps/web/lib/utils.ts — toNumber, formatCurrency, formatDate, formatRelativeTime, and getBaseUrl — have no unit tests. These are used throughout the entire application for displaying currencies, dates, and handling Prisma Decimal conversions.

Functions to test

• toNumber(value) — converts Prisma Decimal, null, undefined, or number to a plain number
• formatCurrency(amount, currency, locale) — formats numbers as currency strings with a space after the symbol
• formatDate(date, options, locale) — formats dates using Intl.DateTimeFormat
• formatRelativeTime(date, locale) — returns human-readable relative time (e.g., "2 hours ago")
• getBaseUrl() — returns the app's base URL from environment variables

Files

• Source: apps/web/lib/utils.ts
• Test file to create: apps/web/__tests__/lib/utils.test.ts

Acceptance criteria

• toNumber tested with: null (returns 0), undefined (returns 0), plain number, Decimal-like object with .toNumber()
• formatCurrency tested with USD, EUR, and INR — verify space between symbol and number
• formatRelativeTime tested with dates in the past (e.g., 5 minutes ago, 2 days ago)
• getBaseUrl tested by mocking process.env with different env var combinations
• All tests pass with pnpm vitest run

[nightcityblade]

Hi, I'd like to work on this. I'll submit a PR shortly.