Replace outdated symbolic geometries with the current curated set and update preference wrappers to match. Add missing alias icons used by System Settings actions (draw-highlight, view-hidden, help-contents, color-picker).
Install org.shift.icons as the look-and-feel icon theme while keeping the Plasma style on breeze-dark. Add the icon-theme coverage guard and CTest registration so shell, System Settings, KCM, and installed Plasma icon names do not silently fall back to missing Breeze-only assets.
Document the theme rules and add scoped REUSE metadata for the Phosphor-derived SVG glyphs.
