Navigation Panel

Struktur item list for quick navigation within the planning tree.

Key Classes

Class	Purpose
NavigationPanelWidget	QListView showing Struktur items in DFS order
NavigationDelegate	Custom delegate for rendering navigation entries

Signals

• struktur_selected(instance_id: str) -- clicked a Struktur item

Notes

• Lists only Struktur-type items from the project
• Clicking an entry expands and selects the corresponding tree node