Improved Error Handling

What's New in v1.0.7

🎯 Improved Error Handling

• Better validation for invalid public key format
• User-friendly messages instead of raw Solana errors
• Helpful usage information when errors occur
• Proper validation for addresses that exist but aren't markets

🔧 Technical Improvements

• Added showUsage() helper function
• Added isValidMarket() validation function
• Improved error context throughout the CLI
• Better error messages in all functions

🐛 Bug Fixes

• Fixed raw Solana error display
• Fixed missing usage information on errors
• Improved error handling in market loading functions