Revert the space filters Toggle and instead don't try to use glass when in the sidebar.

This reverts commit 283029b14976cda1aa567c947c27b09916c88824.

ElementX/Sources/Application/Navigation/NavigationCoordinators.swift

@@ -326,6 +326,11 @@ import SwiftUI
     }
 }
 
+extension EnvironmentValues {
+    /// Whether or not the current view is part of the sidebar module of a `NavigationSplitCoordinator`.
+    @Entry var isInSidebar = false
+}
+
 private struct NavigationSplitCoordinatorView: View {
     @State private var columnVisibility = NavigationSplitViewVisibility.all
     
@@ -381,9 +386,11 @@ private struct NavigationSplitCoordinatorView: View {
         NavigationSplitView(columnVisibility: $columnVisibility) {
             if let sidebarModule = navigationSplitCoordinator.sidebarModule {
                 sidebarModule.coordinator?.toPresentable()
+                    .environment(\.isInSidebar, true)
                     .id(sidebarModule.id)
             } else {
                 navigationSplitCoordinator.placeholderModule.coordinator?.toPresentable()
+                    .environment(\.isInSidebar, true)
                     .id(navigationSplitCoordinator.placeholderModule.id)
             }
         } detail: {

ElementX/Sources/Screens/HomeScreen/View/HomeScreen.swift

@@ -127,22 +127,46 @@ struct HomeScreen: View {
     }
     
     private struct SpaceFiltersButton: View {
+        @Environment(\.isInSidebar) private var isInSidebar
+        
         var selected = false
         var action: () -> Void
         
+        /// Design prefers the custom style over the system's styling of a Toggle within a toolbar,
+        /// however Glass isn't supported for toolbar buttons in the sidebar on iPadOS 26 (likely due
+        /// to glass on glass being discouraged by Apple), so we need to handle our styling accordingly.
+        var shouldUseGlassButtonStyle: Bool {
+            !isInSidebar
+        }
+        
         var body: some View {
-            // Use a Toggle to let the system handle the selection style for both the Liquid Glass
-            // button on iPhone, along with the plain button used in the sidebar on iPad/Mac.
-            Toggle(isOn: .constant(selected)) {
-                CompoundIcon(\.filter)
-                    .foregroundStyle(selected ? .compound.iconOnSolidPrimary : .compound.iconPrimary)
+            if #available(iOS 26, *), shouldUseGlassButtonStyle {
+                if selected {
+                    content
+                        .backportButtonStyleGlassProminent()
+                        .tint(.compound.bgActionPrimaryRest)
+                } else {
+                    content
+                }
+            } else {
+                if selected {
+                    content
+                        .buttonStyle(.compound(.primary, size: .toolbarIcon))
+                } else {
+                    content
+                        .buttonStyle(.compound(.tertiary, size: .toolbarIcon))
+                }
             }
-            .overlay {
-                // The tap gesture is ignored when applied to the toggle so apply it to an overlay instead.
-                Color.black.opacity(0.001)
-                    .onTapGesture(perform: action)
+        }
+        
+        private var content: some View {
+            Button {
+                action()
+            } label: {
+                CompoundIcon(\.filter)
             }
             .accessibilityLabel(L10n.screenRoomlistYourSpaces)
+            .accessibilityAddTraits(selected ? .isSelected : [])
             .accessibilityIdentifier(A11yIdentifiers.homeScreen.spaceFilters)
         }
     }