Merge fix/macos-titlebar-settings into pre-release

cc

# Conflicts:
#	crates/qbz-ui/ui/settings/AppearanceSettings.slint

crates/qbz-ui/ui/app.slint

@@ -59,9 +59,11 @@ export component AppWindow inherits Window {
     // winit attributes hook instead. `no-frame` is the authoritative switch
     // (the adapter re-applies it at every realization — same lesson as the
     // miniplayer, see MiniPlayerWindow below); the persisted pref is seeded
-    // into AppearanceState BEFORE the first show, and changing it takes an
-    // app restart (Wayland negotiates decorations at surface creation).
-    no-frame: !AppearanceState.is-macos && !AppearanceState.use-system-title-bar;
+    // into `system-title-bar-active` BEFORE the first show; the settings
+    // toggle edits the pref (`use-system-title-bar`) and Rust decides per
+    // platform whether it reaches this applied state live (Linux) or only
+    // on the next launch (macOS — attributes fixed at surface creation).
+    no-frame: !AppearanceState.is-macos && !AppearanceState.system-title-bar-active;
     // Edge-resize for the frameless mode (the winit backend only engages it
     // on undecorated windows, so this is inert under system chrome).
     resize-border-width: 6px;

crates/qbz-ui/ui/settings/AppearanceSettings.slint

@@ -694,6 +694,10 @@ export component AppearanceSettings inherits VerticalLayout {
             }
         }
     }
+    // Tiling-WM row: Linux-only — on macOS the native traffic lights are
+    // always present (overlay or system bar), so a "hide completely"
+    // frameless mode does not exist there (same gating idiom as the
+    // WINDOW CONTROLS rows below).
     if !AppearanceState.is-macos: SettingRow {
         label: @tr("Hide title bar");
         description: @tr("Frameless window without window controls or header drag (for tiling window manager users)");

crates/qbz-ui/ui/shell/HeaderBar.slint

@@ -582,7 +582,7 @@ export component HeaderBar inherits Rectangle {
     // the native traffic lights (overlay attributes from the winit hook) and
     // only needs the drag surface + a left inset under the lights.
     property <bool> chrome-drag-enabled:
-        !AppearanceState.use-system-title-bar && !AppearanceState.hide-title-bar;
+        !AppearanceState.system-title-bar-active && !AppearanceState.hide-title-bar;
     property <bool> chrome-controls:
         root.chrome-drag-enabled && !AppearanceState.is-macos
         && AppearanceState.show-window-controls;
@@ -592,7 +592,7 @@ export component HeaderBar inherits Rectangle {
     // Left inset: the native traffic-light band on macOS (~70px logical; 78px
     // keeps a comfortable gap) or the drawn cluster when positioned left.
     property <length> chrome-left-inset:
-        AppearanceState.is-macos && !AppearanceState.use-system-title-bar ? 78px
+        AppearanceState.is-macos && !AppearanceState.system-title-bar-active ? 78px
         : (root.chrome-controls && root.wc-on-left ? root.wc-cluster-width + 6px : 0px);
 
     // Custom-chrome drag surface. Declared FIRST among the header's elements
@@ -938,7 +938,7 @@ export component HeaderBar inherits Rectangle {
             if AppearanceState.show-purchases && !OfflineState.offline
                 && AppearanceState.nav-tb-purchases
                 && !AppearanceState.hide-title-bar
-                && !AppearanceState.use-system-title-bar: VerticalLayout {
+                && !AppearanceState.system-title-bar-active: VerticalLayout {
                 alignment: center;
                 NavTab {
                     icon: @image-url("../assets/icons/shopping-bag.svg");
@@ -1044,7 +1044,7 @@ export component HeaderBar inherits Rectangle {
             if AppearanceState.show-purchases && !OfflineState.offline
                 && AppearanceState.nav-tb-purchases
                 && !AppearanceState.hide-title-bar
-                && !AppearanceState.use-system-title-bar: VerticalLayout {
+                && !AppearanceState.system-title-bar-active: VerticalLayout {
                 alignment: center;
                 CompactDirectBtn {
                     icon: @image-url("../assets/icons/shopping-bag.svg");

crates/qbz-ui/ui/shell/Sidebar.slint

@@ -782,7 +782,7 @@ export component Sidebar inherits Rectangle {
             if AppearanceState.show-purchases && !OfflineState.offline
                 && !(AppearanceState.nav-tb-purchases
                     && !AppearanceState.hide-title-bar
-                    && !AppearanceState.use-system-title-bar): SidebarDirectRow {
+                    && !AppearanceState.system-title-bar-active): SidebarDirectRow {
                 icon: @image-url("../assets/icons/shopping-bag.svg");
                 label: @tr("Purchases");
                 active: NavState.view == ContentView.purchases

crates/qbz-ui/ui/state.slint

@@ -3002,6 +3002,14 @@ export global AppearanceState {
     // macOS = overlay (native traffic lights over the header). The .slint
     // default is the safe Linux one.
     in-out property <bool> use-system-title-bar: true;
+    // APPLIED chrome state (what the window was actually created with, vs the
+    // persisted pref above which the settings toggle edits). All chrome
+    // bindings (no-frame, header drag/inset/controls, Purchases placement)
+    // read THIS one. Rust decides per platform how the pref propagates:
+    // Linux mirrors the pref here live (hot apply, today's behavior); macOS
+    // leaves it at the startup value (the overlay attributes are fixed at
+    // window creation — restart to apply).
+    in-out property <bool> system-title-bar-active: true;
     // Tiling-WM variant: frameless without drawn controls / header drag.
     in-out property <bool> hide-title-bar: false;
     // Phase 2 (deferred): rounded corners matching the desktop decoration.