✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • account unit in LLM

📝 Description

Replace usage of Account#unit in LLM to a new per currency settings.

all remaining usages of account.unit in live-common and cli where a mistake and we always wanted to do getAccountCurrency(account).units[0] for them, notably they are for two usecases:

• formatting (cli / logs / bot / tests): we can afford to use the primary unit
• device transaction verification step: in this case, the device uses the primary unit so we must uses units[0] and not account.unit.

❓ Context

• JIRA or GitHub link: LIVE-11770

🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)