Use UTC time for date handling to ensure consistency across time zones

[RyanMorash]

This pull request updates the date and time handling in script.js to consistently use UTC instead of local time. This ensures that daily game logic and word selection are consistent for all users, regardless of their timezone. The most important changes are:

Resolves issue #15

Consistent UTC Date Handling:

• Changed the calculation of firstgameMilli to use Date.UTC for a timezone-independent epoch.
• Updated getGameNumber and getAbsoluteDate to use UTC-based setters (setUTCHours, setUTCMinutes, etc.) instead of local time setters. [1] [2]
• Modified the game timer logic to increment the date using setUTCDate instead of setDate.

Word Selection Consistency:

• In getWordOfTheDay, updated the random seed for practice mode to use the UTC date, ensuring the same word is selected regardless of the user's local time.

[Copilot]

Pull Request Overview

This pull request standardizes date and time handling to use UTC across the application to ensure consistent behavior for all users regardless of their time zone. This addresses daily game logic, timer functionality, and word selection to prevent discrepancies between users in different time zones.

• Converted date initialization and calculations from local time to UTC
• Updated game timer logic to use UTC date incrementing
• Modified practice mode word selection to use UTC-based random seeding