add dismiss button on start new conversation screen

Session/Home/HomeVC.swift

@@ -868,10 +868,14 @@ final class HomeVC: BaseVC, SessionUtilRespondingViewController, UITableViewData
     }
     
     @objc func createNewConversation() {
-        let viewController = SessionHostingViewController(rootView: StartConversationScreen())
+        let viewController = SessionHostingViewController(
+            rootView: StartConversationScreen(),
+            customizedNavigationBackground: .backgroundSecondary
+        )
         viewController.setNavBarTitle("start_conversation_screen_title".localized())
+        viewController.setUpDismissingButton(on: .right)
+        
         let navigationController = StyledNavigationController(rootViewController: viewController)
-        navigationController.view.backgroundColor = .blue
         if UIDevice.current.isIPad {
             navigationController.modalPresentationStyle = .fullScreen
         }

Session/Home/New Conversation/StartConversationScreen.swift

@@ -76,7 +76,7 @@ struct StartConversationScreen: View {
                     .aspectRatio(1, contentMode: .fit)
                     .padding(.vertical, Values.smallSpacing)
                 }
-                .padding(.all, Values.largeSpacing)
+                .padding(.horizontal, Values.largeSpacing)
             }
         }
         .backgroundColor(themeColor: .backgroundSecondary)

Session/Shared/SessionHostingViewController.swift

@@ -7,10 +7,18 @@ public class HostWrapper: ObservableObject {
     public weak var controller: UIViewController?
 }
 
-public class SessionHostingViewController<Content>: UIHostingController<ModifiedContent<Content,SwiftUI._EnvironmentKeyWritingModifier<HostWrapper?>>> where Content : View {
+public enum NavigationItemPosition {
+    case left
+    case right
+}
+
+public class SessionHostingViewController<Content>: UIHostingController<ModifiedContent<Content, _EnvironmentKeyWritingModifier<HostWrapper?>>>, ThemedNavigation where Content : View {
     public override var preferredStatusBarStyle: UIStatusBarStyle {
         return ThemeManager.currentTheme.statusBarStyle
     }
+    
+    public var navigationBackground: ThemeValue { customizedNavigationBackground ?? .backgroundPrimary }
+    private let customizedNavigationBackground: ThemeValue?
 
     lazy var navBarTitleLabel: UILabel = {
         let result = UILabel()
@@ -32,7 +40,8 @@ public class SessionHostingViewController<Content>: UIHostingController<Modified
         return result
     }()
     
-    public init(rootView:Content) {
+    public init(rootView:Content, customizedNavigationBackground: ThemeValue? = nil) {
+        self.customizedNavigationBackground = customizedNavigationBackground
         let container = HostWrapper()
         let modified = rootView.environmentObject(container) as! ModifiedContent<Content, _EnvironmentKeyWritingModifier<HostWrapper?>>
         super.init(rootView: modified)
@@ -94,4 +103,19 @@ public class SessionHostingViewController<Content>: UIHostingController<Modified
         
         navigationItem.titleView = logoImageView
     }
+    
+    internal func setUpDismissingButton(on postion: NavigationItemPosition) {
+        let closeButton = UIBarButtonItem(image: #imageLiteral(resourceName: "X"), style: .plain, target: self, action: #selector(close))
+        closeButton.themeTintColor = .textPrimary
+        switch postion {
+            case .left:
+                navigationItem.leftBarButtonItem = closeButton
+            case .right:
+                navigationItem.rightBarButtonItem = closeButton
+        }
+    }
+    
+    @objc private func close() {
+        dismiss(animated: true, completion: nil)
+    }
 }