feat: add progress for notarization request and resurface error message

[0xtsukino]

[heeckhau]

@0xtsukino you video looks amazing 💯

• When I compile this I only see this until it is ready:

• And how did you pick the different phases? 1 and 2 flash by, same with 5.
  Maybe:

  1. Setup Prover
  2. Setup MPC with Notary
  3. Send request
  4. Commit to transcript and wait for attestation

• Can we show progress in the sidebar too?

[0xtsukino]