KWin Overview 6.6 asks for the raw delete icon name on its virtual desktop delete button. Provide delete and delete-symbolic in the Shift icon theme, and point nearby KDE delete aliases at the existing close glyph so the button renders as an X instead of a fallback icon.
Guard the aliases in the icon theme coverage check.
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.
