Force soft top scroll edge effect for banner and video info views

iOS 27 changes the default scroll edge effect style to hard, which
draws a sharp cutoff line over the channel banner and video info
gradient extending under the toolbar.

Yattee/Views/Channel/ChannelView.swift

@@ -368,6 +368,7 @@ struct ChannelView: View {
         }
         .background(viewBackgroundColor)
         .ignoresSafeArea(edges: .top)
+        .softTopScrollEdgeEffect()
         #if os(macOS)
         .overlay(alignment: .top) {
             legacyToolbarScrim
@@ -533,6 +534,7 @@ struct ChannelView: View {
         }
         .background(viewBackgroundColor)
         .ignoresSafeArea(edges: .top)
+        .softTopScrollEdgeEffect()
         #if os(macOS)
         .overlay(alignment: .top) {
             legacyToolbarScrim

Yattee/Views/Video/VideoInfoView.swift

@@ -545,6 +545,7 @@ struct VideoInfoView: View {
                 #if !os(tvOS)
                 .scrollDismissesKeyboard(.interactively)
                 #endif
+                .softTopScrollEdgeEffect()
                 .modifier(VideoInfoScrollOffsetModifier(scrollOffset: $scrollOffset))
 
                 #if os(macOS)