updated updatetheme to add the theme if not present

added a new theme button with a avigation destination

ShhShell/Host/HostsManager.swift

@@ -129,7 +129,11 @@ class HostsManager: ObservableObject, @unchecked Sendable {
 	}
 	
 	func updateTheme(_ theme: Theme) {
-		guard let index = themes.firstIndex(where: { $0.id == theme.id }) else { return }
+		guard let index = themes.firstIndex(where: { $0.id == theme.id }) else {
+			themes.append(theme)
+			saveThemes()
+			return
+		}
 		themes[index] = theme
 		if selectedTheme.id == theme.id {
 			selectedTheme = theme

ShhShell/Views/Themes/ThemeManagerView.swift

@@ -14,6 +14,9 @@ struct ThemeManagerView: View {
 	@State var importURL: String = ""
 	@State var toImportName: String = ""
 	
+	@State private var newTheme: Theme = Theme.defaultTheme
+	@State private var showNewThemeEditor: Bool = false
+	
 	var minColWidth: CGFloat {150}
 	var spacing: CGFloat {8}
 	var grid: GridItem {
@@ -121,6 +124,17 @@ struct ThemeManagerView: View {
 							}
 							
 						}
+						ToolbarItem() {
+							Button() {
+								newTheme = Theme.defaultTheme
+								showNewThemeEditor = true
+							} label: {
+								Label("New", systemImage: "plus")
+							}
+						}
+					}
+					.navigationDestination(isPresented: $showNewThemeEditor) {
+						ThemeEditorView(hostsManager: hostsManager, theme: $newTheme)
 					}
 				}
 			}