feat(macos): add native menu bar app with notch overlay

Introduces a SwiftUI companion app for the Fail Well PWA: menu bar
status item, popover with task list / record / history views, command
palette, and a Dynamic Island-style notch overlay that shows the active
step and timer beside the hardware notch and expands on hover to reveal
pause/next controls.

macos/Sources/FailWell/Views/SettingsView.swift

@@ -0,0 +1,17 @@
+import KeyboardShortcuts
+import SwiftUI
+
+struct SettingsView: View {
+    var body: some View {
+        Form {
+            Section("Global hotkey") {
+                KeyboardShortcuts.Recorder("Toggle popover:", name: .togglePopover)
+                Text("Three modifiers + a letter is recommended — single- and two-modifier combos collide with system shortcuts.")
+                    .font(Theme.monoSmall)
+                    .foregroundStyle(Theme.dim)
+            }
+        }
+        .formStyle(.grouped)
+        .frame(width: 420, height: 200)
+    }
+}