Minor QoL changes, and some balancing:

• Added a separate volume slider for coin sound effects.
  
• Improved character mining speed from 0.8 to 0.5 seconds.
• Removed the Recipe Book from crafting station to reduce confusion.
• Left click now skips the typewriter text effect.
• Made mining upgrades cheaper.
• Rebalanced inventory expansion costs to scale more gradually early on, with steeper costs only later.
• Reduced material drop rates from 5% to 2% per upgrade.
• Added more affordable Guild Size upgrades.
• Applicants are now generated with weighted class distributions for better variety and balance