Trade Overhaul

Fixes:

• Fixed villager experience gain when selling items
• Fixed repair price display with Shift/Ctrl modifiers support
• Fixed critical bug with negative villager balance
• Fixed villager distraction during interaction
• Fixed experience and level synchronization when opening GUI
• Fixed tooltip price color indicator

Improvements:

• Improved craft recipe synchronization between server and client
• Improved tooltip display in trade window
  • Added quantity calculation with key modifiers (1/10/full stack)
  • Added price formatting (gold/silver/copper instead of plain copper)
  • Added expected XP display for transactions
• Added tooltips for "Repair" and "Repair All" buttons in repair window
• Added ability to view all craft recipes regardless of villager level
• Improved villager restock system

Technical changes:

• Reworked recipe sync system
• Added villager inventory synchronization when opening GUI