Consolidate time/duration utilities into single module

[vertefra]

Problem

Time formatting logic is scattered across multiple files:

popup.tsx (lines 232-274):

• formatTimeRemaining() - formats countdown time
• formatSnoozeTime() - formats snooze timestamp

popup.tsx (lines 292-301):

• parsePrice() - parses price strings
• formatMoney() - formats currency

utils/time.ts:

• formatDuration() - formats duration

Solution

Create unified utilities module:

// utils/formatters.ts

export const timeFormatters = {
  formatTimeRemaining(reminderTime: number): string { ... },
  formatSnoozeTime(timestamp: number): string { ... },
  formatDuration(durationMs: number): string { ... }
}

export const currencyFormatters = {
  parsePrice(priceString: string | null): number { ... },
  formatMoney(amount: number, currency: string = "$"): string { ... }
}

Benefits

• Single source of truth for formatting
• Better organized and discoverable
• Easier to test
• Consistent formatting across the app

Priority

Medium