Revert "Refine app grid material background"

Ariver

2026-06-19 50e354e29ead4f3f2ef794cd6c92522ea563fc43

 src/Apptag/ContentView.swift

@@ -492,7 +492,7 @@
    var body: some View {
        ZStack {
            if shouldRenderAppGridBehindQuickSearch {
                VisualEffectView(material: .contentBackground, blendingMode: .behindWindow)
                VisualEffectView(material: .hudWindow, blendingMode: .behindWindow)
                    .ignoresSafeArea()
                    .allowsHitTesting(false)
            }