fixup! ✨(frontend) add floating bar with collapse button

Author: Ovgodd

src/frontend/apps/impress/src/features/docs/doc-header/floating-bar/components/FloatingBar.tsx

@@ -39,6 +39,8 @@ export const FloatingBar = () => {
       background: linear-gradient(180deg, #fff 0%, rgba(255, 255, 255, 0) 100%);
       backdrop-filter: blur(1px);
       -webkit-backdrop-filter: blur(1px);
+      mask-image: linear-gradient(180deg, black 0%, transparent 100%);
+      -webkit-mask-image: linear-gradient(180deg, black 50%, transparent 100%);
 
       > * {
         position: relative;