Open Settings in its own roomy window, not the cramped popover

Settings was a NavigationLink pushed inside the 320pt menu-bar popover, so the
grouped form was cramped and most controls sat below a non-obvious scroll (and
showed a confusing "< Settings" back arrow). Add SettingsWindow (same standalone
NSWindow pattern as the Editor/Templates windows) and open it from the menu-bar
"Settings…" button. Drop the now-unused NavigationStack and the 320pt cap so the
form uses real window width with normal macOS spacing; window is resizable.

Ten31Transcripts/UI/MenuBarView.swift

@@ -10,21 +10,19 @@ struct MenuBarView: View {
     @EnvironmentObject private var session: SessionController
 
     var body: some View {
-        NavigationStack {
-            VStack(alignment: .leading, spacing: 12) {
-                header
-                Divider()
-                recordingSection
-                Divider()
-                permissionsSection
-                Divider()
-                backendSection
-                Divider()
-                footer
-            }
-            .padding(14)
-            .frame(width: 320)
+        VStack(alignment: .leading, spacing: 12) {
+            header
+            Divider()
+            recordingSection
+            Divider()
+            permissionsSection
+            Divider()
+            backendSection
+            Divider()
+            footer
         }
+        .padding(14)
+        .frame(width: 320)
         .onAppear { permissions.refresh() }
         .task { await refreshHealth() }
     }
@@ -227,9 +225,7 @@ struct MenuBarView: View {
 
     private var footer: some View {
         HStack {
-            NavigationLink("Settings…") {
-                SettingsView()
-            }
+            Button("Settings…") { SettingsWindow.shared.show(settings: settings) }
             Spacer()
             Button("Quit") { NSApplication.shared.terminate(nil) }
         }