- Bump version to 0.4.2 across all workspace crates
- Add qrcode dependency to workspace and kobe-cli
- Add --qr flag to all wallet generation and import commands (Bitcoin, Ethereum, Solana)
- Implement QR code terminal rendering using Unicode half-block characters
- Add qr module with render_to_terminal() function for compact QR display
- Update print_wallet() and print_standard_wallet() functions to conditionally display QR codes
- Format