feat: Make all windows float above other apps

Sources/Insomnia/FloatingWindowModifier.swift

@@ -0,0 +1,54 @@
+// FloatingWindowModifier.swift — Insomnia GUI
+//
+// A SwiftUI ViewModifier that makes a window float above all other windows.
+// Uses NSViewRepresentable to find the specific hosting NSWindow rather than
+// iterating all app windows. Important for LSUIElement menu bar apps where
+// windows should stay visible even when the user clicks on other applications.
+
+import AppKit
+import SwiftUI
+
+/// Makes the hosting NSWindow float above all other windows.
+///
+/// Finds the NSWindow backing the SwiftUI view and sets its
+/// level to `.floating`. This keeps Insomnia's windows visible even when
+/// focus moves to another app — important for a menu bar utility.
+struct FloatingWindow: ViewModifier {
+    /// Applies the floating window level to the view's hosting window.
+    func body(content: Content) -> some View {
+        content
+            .background(FloatingWindowAccessor())
+    }
+}
+
+/// Resolves the specific NSWindow hosting the modified SwiftUI view.
+///
+/// Uses `NSViewRepresentable` to access the underlying `NSView`, then
+/// reads its `.window` property to set the level. This avoids iterating
+/// all app windows and eliminates timing-based delays.
+private struct FloatingWindowAccessor: NSViewRepresentable {
+    /// Creates the backing NSView and sets its window to floating level.
+    func makeNSView(context: Context) -> NSView {
+        let view = NSView()
+        // Set floating level once the view is attached to a window
+        DispatchQueue.main.async {
+            view.window?.level = .floating
+        }
+        return view
+    }
+
+    /// Re-applies floating level when the view updates (e.g., window reappears).
+    func updateNSView(_ nsView: NSView, context: Context) {
+        DispatchQueue.main.async {
+            nsView.window?.level = .floating
+        }
+    }
+}
+
+/// Convenience extension for applying the floating window modifier.
+extension View {
+    /// Makes the hosting window float above all other windows.
+    func floatingWindow() -> some View {
+        modifier(FloatingWindow())
+    }
+}

Sources/Insomnia/InsomniaApp.swift

@@ -44,20 +44,23 @@ struct InsomniaApp: App {
         Window("Settings", id: "settings") {
             if let viewModel {
                 SettingsView(viewModel: SettingsViewModel(configuration: viewModel.configuration))
+                    .floatingWindow()
             }
         }
         .windowResizability(.contentSize)
 
         // About dialog window — uses BuildEnvironment for variant-aware title
         Window("About \(BuildEnvironment.appName)", id: "about") {
             AboutView()
+                .floatingWindow()
         }
         .windowResizability(.contentSize)
 
         // Custom duration picker window
         Window("Custom Duration", id: "duration-picker") {
             if let viewModel {
                 DurationPickerView(viewModel: viewModel)
+                    .floatingWindow()
             }
         }
         .windowResizability(.contentSize)
@@ -66,6 +69,7 @@ struct InsomniaApp: App {
         Window("Caffeinate Until", id: "time-picker") {
             if let viewModel {
                 TimePickerView(viewModel: viewModel)
+                    .floatingWindow()
             }
         }
         .windowResizability(.contentSize)
@@ -74,6 +78,7 @@ struct InsomniaApp: App {
         Window("Schedules", id: "schedules") {
             if let viewModel {
                 ScheduleEditorView(viewModel: viewModel)
+                    .floatingWindow()
             }
         }
         .windowResizability(.contentSize)