Address comments from original PR

[TorstenStueber]

This is a PR that addresses the comments from PR https://github.com/pendulum-chain/vortex/pull/159.

The reason was that PR https://github.com/pendulum-chain/vortex/pull/159 was closed before the review happened.

Some remarks:

• this also fixes the bug that the UI does not properly deal with the case that the user declines the Polygon transactions in the wallet
• for that reason this PR now distinguishes between recoverable and unrecoverable errors and the isFailure Boolean flag has been replaced with an optional failure variable that can be "recoverable" or "unrecoverable" (such as is the case for the user declining in the wallet)

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