Phase navigation no longer flickers

Phase tabs stay mounted when switching between Work Areas, Estimate, and other tabs — zero UI reloads.

Improvements

Phase headers and navigation tabs now remain mounted when you switch between Work Areas, Estimate, Authorization, and Invoice tabs. Previously, the header would remount on each tab switch, causing a brief flicker. This is now seamless — the navigation chrome stays in place while only the tab content changes.

Project header bands also persist across navigation, reducing visual churn when moving between related work areas in a project.