TODO: Remove remaining IIFEs in ACP UI; prefer plain components/helpers.

Progress (last 2 days):
- Reached 100% test coverage across the codebase.
- Added extensive Feature and Unit tests for controllers, models, services, and console commands.
- Added coverage scripts and cleanup (tests for update/version flows, system update/status, attachments, forums, roles, ranks, settings, portal, etc.).
- Hardened tests with fakes/mocks to cover error paths and edge cases.