Move device checks to Theme

Drop unused code along the way.

Passepartout/App/Constants/Theme.swift

@@ -26,20 +26,31 @@
 import SwiftUI
 import PassepartoutCore
 
-extension Color {
-    init(red: Double, green: Double, blue: Double, brightness: Double) {
-        self.init(
-            red: red * brightness,
-            green: green * brightness,
-            blue: blue * brightness
-        )
-    }
-}
-
 extension View {
     var themeIdiom: UIUserInterfaceIdiom {
         UIDevice.current.userInterfaceIdiom
     }
+    
+    var themeIsiPad: Bool {
+        #if targetEnvironment(macCatalyst)
+        false
+        #else
+        UIDevice.current.userInterfaceIdiom == .pad
+        #endif
+    }
+    
+    var themeIsiPadPortrait: Bool {
+        #if targetEnvironment(macCatalyst)
+        false
+        #else
+        let device: UIDevice = .current
+        return device.userInterfaceIdiom == .pad && device.orientation.isPortrait
+        #endif
+    }
+    
+    var themeIsMultitasking: Bool {
+        UIDevice.current.isMultitaskingSupported
+    }
 }
 
 // MARK: Global

Passepartout/App/Views/OrganizerView+Profiles.swift

@@ -58,8 +58,9 @@ extension OrganizerView {
         private var mainView: some View {
             List {
                 if profileManager.hasProfiles {
-                    if #available(iOS 15, *), themeIdiom == .pad {
-                        // FIXME: iPad multitasking, navigation binding does not clear on pop without Section
+
+                    // FIXME: iPad multitasking, navigation binding does not clear on pop without Section
+                    if themeIsiPad && themeIsMultitasking {
                         Section {
                             profilesView
                         } header: {

Passepartout/App/Views/OrganizerView+Scene.swift

@@ -78,7 +78,7 @@ extension OrganizerView {
                 return
             }
             isFirstLaunch = false
-            if !isiPadPortrait, let activeProfileId = profileManager.activeProfileId {
+            if !themeIsiPadPortrait, let activeProfileId = profileManager.activeProfileId {
                 profileManager.currentProfileId = activeProfileId
             }
         }
@@ -103,10 +103,5 @@ extension OrganizerView {
         private func persist() {
             profileManager.persist()
         }
-        
-        private var isiPadPortrait: Bool {
-            let device: UIDevice = .current
-            return device.userInterfaceIdiom == .pad && device.orientation.isPortrait
-        }
     }
 }