feat: handle archived ledger entries in simulation results

[Hollujay]

Summary

A simulation can return a restorePreamble, indicating the call touches
archived entries that must be restored before the real transaction can be
submitted. Right now this is presumably ignored, so a user could see a clean
diff without learning the call needs a restore first.

Acceptance Criteria

• Detect restorePreamble in the simulation response
• Display a clear notice that a restore operation is required first
• Do not present the simulation as straightforwardly submittable when this
  is present

Tech Stack

TypeScript, @stellar/stellar-sdk