Portfolio explorer toggle to show/hide business-unit nodes

Table of Contents

This page is a capture in the next bucket of the product backlog — a pre-sprint idea, not yet pulled into a sprint as a story.

What

Narrowed during deep backlog refinement (2026-07-11): this capture originally asked for two things. Part 1 (book → business unit FK) is already done — book.hpp has std::optional<boost::uuids::uuid> owner_unit_id, documented as the FK to business_units. Only Part 2 remains and is what this capture now tracks:

The portfolio explorer tree mixes books, portfolios, and business units with no way to toggle business-unit nodes on/off. Add a toolbar toggle "Show Business Units" that inserts business-unit nodes between the party level and the book/portfolio level when enabled. Checked PortfolioExplorerTreeModel.cpp=/=PortfolioExplorerMdiWindow.cpp — no such toggle exists yet.

Why

(Motivation, problem being solved, related context.)

References

See also

Emacs 29.3 (Org mode 9.6.15)