Settings UI and code improvements

macOS/Settings/AccountSettingsView.swift

@@ -0,0 +1,54 @@
+import Defaults
+import SwiftUI
+
+struct AccountSettingsView: View {
+    let account: Instance.Account
+    @Binding var selectedAccount: Instance.Account?
+
+    @State private var presentingRemovalConfirmationDialog = false
+
+    @EnvironmentObject<InstancesModel> private var instances
+
+    var body: some View {
+        HStack {
+            HStack(spacing: 2) {
+                Text(account.description)
+                if instances.defaultAccount == account {
+                    Text("— default")
+                        .foregroundColor(.secondary)
+                }
+            }
+
+            Spacer()
+
+            HStack {
+                if instances.defaultAccount != account {
+                    Button("Make default", action: makeDefault)
+                } else {
+                    Button("Reset default", action: resetDefault)
+                }
+                Button("Remove", role: .destructive) {
+                    presentingRemovalConfirmationDialog = true
+                }
+                .confirmationDialog(
+                    "Are you sure you want to remove \(account.description) account?",
+                    isPresented: $presentingRemovalConfirmationDialog
+                ) {
+                    Button("Remove", role: .destructive) {
+                        instances.removeAccount(account)
+                    }
+                }
+                .foregroundColor(.red)
+            }
+            .opacity(account == selectedAccount ? 1 : 0)
+        }
+    }
+
+    private func makeDefault() {
+        instances.setDefaultAccount(account)
+    }
+
+    private func resetDefault() {
+        instances.resetDefaultAccount()
+    }
+}