US-3.15not implemented Verify transaction data is up to date
As a user who cannot find a match because the bank CSV does not yet contain recent transactions I want select option "3. Check if transactions for this account are up to date" and see the latest transaction date in the CSV so that I know whether I need to download a newer CSV export from my bank.
Acceptance Criteria
- The TUI shows the date of the most recent transaction in the CSV for the relevant account.
- Currently raises `NotImplementedError("Did not implement this yet.")`.
No DAG diagram: Not yet implemented — TUI diagnostic action; reads CSV metadata but does not produce data flowing through DAG layers.
Demo video coming soon