Add a per-connection account management screen for Enable Banking so users
can revisit the accounts they skipped (or want to re-target) after the
initial connection flow.
- Known accounts render from the DB with no provider call; users can stop
syncing an account (it becomes a non-destructive manual account, keeping
its transactions) or move syncing to another manual account.
- A 'Load accounts' button re-fetches the consent's account list from the
provider on demand (getSession + getAccount for unknown uids) to surface
newly available accounts, which can then be created or linked.
- The provider is only ever hit on refresh; mutations are DB-only.
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