Enhancements: Improved Battle Logic, Player Death Handling, and Mana Management

[Sean-Randall]

This pull request introduces several improvements to the battle mechanics:

• Displays HP/MP status at each round's start for players and enemies.
• Prevents the casting of spells if the player’s mana is insufficient.
• Fixes player death logic to ensure the game responds correctly when a player reaches 0 HP.
• Updates enemy attack behavior to make battles more dynamic.
• Adds a new white magic spell, "ManaDump," to help with testing low HP scenarios.

These changes aim to enhance gameplay and ensure better handling of game mechanics, especially with mana management and player death handling.