Fix remaining accessibility issues

[mvaivre]

Accessibility issues:

• Pressing enter on passphrase toggle when wallet and password are entered submits the form instead of expanding the section
• Toggling the checkbox for "I understand that..." and then going to the passphrase input and typing doesnt work
• Copy buttons are being tabbed to in the transaction rows
• Double text being spoken (hidden text and the visible text) in the transaction rows
• Offline mode icon not tabbable (should be so blind user can listen to screen reader and know wallet is offline...)

Everything else is more or less fine

Originally posted by @LeeAlephium in #378 (comment)