ios: wallpapers (#4304)

* ios: wallpapers

* theme selection

* applied theme colors and preset wallpaper

* more places with background

* one more

* accent color

* defaults

* rename

* background

* no change to cell color

* unneeded

* changes

* no global tint

* defaults

* removed unneeded class

* for merging

apps/ios/Shared/Views/Chat/VerifyCodeView.swift

@@ -66,6 +66,7 @@ struct VerifyCodeView: View {
                                 ScanCodeView(connectionVerified: $connectionVerified, verify: verify)
                                     .navigationBarTitleDisplayMode(.large)
                                     .navigationTitle("Scan code")
+                                    .modifier(ThemedBackground())
                             } label: {
                                 Label("Scan code", systemImage: "qrcode")
                             }