Contract Tab Update

[donnyquixotic]

Description

• [x] connection button above write
• [x] write button visible when logged out
• [x] green verification on contract header
• [x] if not logged in, on click 'write' prompt connection first
• [x] expand contract interface to full width of container
• [x] source code scroll styling
• [x] handle opacity issues with buttons/dropdowns/headers