Update currency details to use tabs

This page is a capture in the discarded bucket of the product backlog.

Resolved (deep backlog refinement, 2026-07-11): CurrencyDetailDialog.ui already implements a QTabWidget with tabs: General (incl. Icon), Formatting, Rounding, Provenance – the Provenance tab serves the 'system tab with temporal data, read-only' role described in the capture. Confirmed via projects/ores.qt/refdata/ui/CurrencyDetailDialog.ui and CurrencyDetailDialog.cpp (tabWidget() accessor).

We need a main tab with the currency related properties, then a "system" tab with temporal data which is read-only even on edit and a "image" tab with the image used to represent the currency. It could also contain some description or notes.