fix(settings): harden migration and accessibility

Apply interface scaling through Qt at startup, complete keyboard navigation, move account migration into setup and progress modals, and defer Subsonic sync while the server scans.

cx

crates/qbz-qt/qml/controls/QbzConfirmModal.qml

@@ -70,16 +70,16 @@ Item {
         root._open = true
         // AFTER _open, so `visible` is already true — an invisible item cannot
         // take active focus and the Esc handler would be dead.
-        keyScope.forceActiveFocus()
+        Qt.callLater(function () { cancelButton.forceActiveFocus() })
     }
     function close() {
         root._open = false
         root._restoreShellFocus()
     }
-    // §1.4.3 (2026-08-03 hotkeys-port contract): keyScope GRABS focus on open
-    // and Qt strands activeFocus on the now-invisible item at close, which
-    // kills the AppShell key dispatcher until the next click. Restore the
-    // shell root — the dispatcher's fallback focus item — on every close
+    // §1.4.3 (2026-08-03 hotkeys-port contract): a modal control GRABS focus
+    // on open and Qt strands activeFocus on that now-invisible item at close,
+    // which kills the AppShell key dispatcher until the next click. Restore
+    // the shell root — the dispatcher's fallback focus item — on every close
     // path. Duck-walk, because this modal mounts under several parents (the
     // Blacklist manager, FolderModals, MyQBZ delete).
     function _restoreShellFocus() {
@@ -105,15 +105,9 @@ Item {
     enabled: root._open
     z: 3100
 
-    // Esc dismiss (the Slint esc-scope FocusScope, :1006-1017). No visual and
-    // no MouseArea, so it never intercepts a press meant for the scrim.
-    FocusScope {
-        id: keyScope
-        anchors.fill: parent
-        Keys.onEscapePressed: function (event) {
-            root._cancel()
-            event.accepted = true
-        }
+    Keys.onEscapePressed: function (event) {
+        root._cancel()
+        event.accepted = true
     }
 
     // Scrim. `radius` is load-bearing, not decoration: this Item fills the
@@ -197,11 +191,29 @@ Item {
                     spacing: 10
 
                     Rectangle {
+                        id: cancelButton
                         width: cancelLbl.implicitWidth + 32
                         height: 36
                         radius: theme.radiusSm
                         color: cancelArea.containsMouse ? theme.surfaceHover
                                                         : theme.surfaceElevated
+                        activeFocusOnTab: root.opened
+                        border.width: activeFocus ? 2 : 0
+                        border.color: theme.accent
+                        Accessible.role: Accessible.Button
+                        Accessible.name: root.cancelLabel
+                        Accessible.onPressAction: root._cancel()
+                        KeyNavigation.tab: confirmButton
+                        KeyNavigation.backtab: confirmButton
+                        Keys.onPressed: function (event) {
+                            if (!event.isAutoRepeat
+                                    && (event.key === Qt.Key_Space
+                                        || event.key === Qt.Key_Return
+                                        || event.key === Qt.Key_Enter)) {
+                                root._cancel()
+                                event.accepted = true
+                            }
+                        }
                         Text {
                             id: cancelLbl
                             anchors.centerIn: parent
@@ -214,10 +226,12 @@ Item {
                             anchors.fill: parent
                             hoverEnabled: true
                             cursorShape: Qt.PointingHandCursor
+                            onPressed: cancelButton.forceActiveFocus()
                             onClicked: root._cancel()
                         }
                     }
                     Rectangle {
+                        id: confirmButton
                         width: confirmLbl.implicitWidth + 32
                         height: 36
                         radius: theme.radiusSm
@@ -225,6 +239,23 @@ Item {
                             ? (confirmArea.containsMouse ? Qt.darker(theme.danger, 1.12)
                                                          : theme.danger)
                             : (confirmArea.containsMouse ? theme.accentHover : theme.accent)
+                        activeFocusOnTab: root.opened
+                        border.width: activeFocus ? 2 : 0
+                        border.color: root.danger ? "#ffffff" : theme.accentGlyphColor
+                        Accessible.role: Accessible.Button
+                        Accessible.name: root.confirmLabel
+                        Accessible.onPressAction: root._confirm()
+                        KeyNavigation.tab: cancelButton
+                        KeyNavigation.backtab: cancelButton
+                        Keys.onPressed: function (event) {
+                            if (!event.isAutoRepeat
+                                    && (event.key === Qt.Key_Space
+                                        || event.key === Qt.Key_Return
+                                        || event.key === Qt.Key_Enter)) {
+                                root._confirm()
+                                event.accepted = true
+                            }
+                        }
                         Text {
                             id: confirmLbl
                             anchors.centerIn: parent
@@ -244,6 +275,7 @@ Item {
                             anchors.fill: parent
                             hoverEnabled: true
                             cursorShape: Qt.PointingHandCursor
+                            onPressed: confirmButton.forceActiveFocus()
                             onClicked: root._confirm()
                         }
                     }