* Backport upstream 5446d1f visual effects Adapt upstream transparency, backdrop, blur, and glass styling controls to Overzicht's settings.json model without reintroducing upstream config.json handling. Cherry-picked-from: 5446d1f * Fix visual effects rounding defaults and layer namespace Restore upstream rounding defaults in the fork, fix the panel radius calculation so zero rounding stays zero, remove the blur-specific namespace switching, and update docs/examples to match. User Nix config now overrides rounding back to zero explicitly. * Remove glass mode and hardcode zero rounding Remove the glass-mode feature surface and related styling, hardcode overview rounding values to zero, and document configurable rounding and glass-mode styling as removed fork features.