feat(lib): add price utilities and expand time utilities

[AdekunleBamz]

Summary

Add comprehensive utility modules for marketplace price and time operations with full test coverage.

New: webapp/src/lib/price.ts

A complete price utility library for working with MANA prices in wei format:

Function	Description
formatPrice	Format wei to human-readable price with currency symbol
formatPriceCompact	Compact notation for large values (1.5M, 25K)
calculatePriceChange	Calculate percentage change between prices
formatPriceChange	Format change with +/- prefix and % suffix
isPriceInRange	Check if price falls within min/max bounds
isValidPriceInput	Validate user price input strings
etherToWei / weiToEther	Conversion utilities
calculateTotalPrice	Multiply unit price by quantity
comparePrices	Compare two prices (-1, 0, 1)
getMinPrice / getMaxPrice	Find extremes in price arrays
getAveragePrice	Calculate average from price array

Enhanced: webapp/src/lib/time.ts

Expanded the existing time module with additional utilities:

Function	Description
fromSecondsToMilliseconds	Inverse of existing function
isExpired / isExpiredSeconds	Expiration checks for both formats
getTimeRemaining	Calculate remaining time until expiration
formatTimeRemaining	Human-readable duration (e.g., "2d 5h", "45m")
DURATION	Constants for SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, YEAR
addDaysToTimestamp	Date arithmetic helper
getStartOfDay / getEndOfDay	Day boundary utilities
daysBetween	Calculate days between timestamps
isWithinLastDays	Recency checks
formatRelativeTime	Relative time strings ("2 hours ago", "in 3 days")

Testing

• price.spec.ts: 25+ test cases covering all price functions
• time.spec.ts: 30+ test cases covering all time functions
• Follows existing project test patterns using Jest

Use Cases

• Price Display: Format prices consistently across the marketplace UI
• Price Comparison: Compare listings, calculate savings, show price changes
• Order Expiration: Display time remaining, check if orders are expired
• Analytics: Calculate average prices, price ranges for collections
• Filtering: Validate price inputs, check price bounds

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