Improve error feedback

[sohrab-]

As a client app, we should not be doing aggressive error handling, as it will hide the behaviour of the chain and diminishes the value of being a true generalised client.

That said, any errors that are caused by how we code things, should be handled and the error messages should easily identify which field in which instruction has caused the issue.

• Error messages, that include the field coordinates, should be links that scroll up to the offending field.
• Offending fields should have an error style, i.e. Chakra's isInvalid red borders.