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/QbzSelect.qml

@@ -38,8 +38,8 @@ Rectangle {
     width: sm ? Math.max(0, menuWidth - 40) : menuWidth
     height: sm ? 30 : 34
     radius: sm ? 6 : theme.radiusSm
-    border.width: sm ? 0 : 1
-    border.color: theme.borderSubtle
+    border.width: selectRoot.activeFocus ? 2 : (sm ? 0 : 1)
+    border.color: selectRoot.activeFocus ? theme.accent : theme.borderSubtle
     // Resting fill goes translucent under the dynamic background so the field
     // shows through the control (QbzSelect.slint:110-116). Hover keeps its own
     // token, which is already translucent.
@@ -47,6 +47,33 @@ Rectangle {
         ? theme.surfaceHover
         : (theme.ambientOn ? theme.surfaceElevatedA50 : theme.surfaceElevated)
     opacity: enabled ? 1.0 : 0.4
+    activeFocusOnTab: enabled
+    Accessible.role: Accessible.ComboBox
+    Accessible.name: currentIndex >= 0 && currentIndex < options.length
+        ? optLabel(currentIndex) : ""
+    Accessible.onPressAction: selectRoot.openPopup()
+
+    Keys.onPressed: function (event) {
+        if (!selectRoot.enabled || event.isAutoRepeat)
+            return
+        if (event.key === Qt.Key_Space
+                || event.key === Qt.Key_Return
+                || event.key === Qt.Key_Enter) {
+            if (popup.opened)
+                popup.close()
+            else
+                selectRoot.openPopup()
+        } else if (event.key === Qt.Key_Up && selectRoot.currentIndex > 0) {
+            selectRoot.selected(selectRoot.currentIndex - 1)
+        } else if (event.key === Qt.Key_Down
+                   && selectRoot.currentIndex + 1 < selectRoot.options.length) {
+            selectRoot.selected(selectRoot.currentIndex + 1)
+        } else {
+            return
+        }
+        // Do not let Space reach the global play/pause binding.
+        event.accepted = true
+    }
 
     // `width`, NOT `menuWidth`: QbzSelect.slint:89-91 resolves the open list as
     // `max(popup-width, EFF-WIDTH)`, and eff-width is `menu-width - 40px` at
@@ -88,10 +115,37 @@ Rectangle {
         if (!selectRoot.enabled || selectRoot.options.length === 0)
             return
         selectRoot.filter = ""
+        listContent.currentIndex = selectRoot.currentIndex
         popup.open()
         if (selectRoot.searchable)
             searchInput.forceActiveFocus()
     }
+    function optionMatches(i) {
+        return i >= 0 && i < options.length
+            && (filter === ""
+                || optLabel(i).toLowerCase().indexOf(filter.toLowerCase()) >= 0)
+    }
+    function moveSearchHighlight(delta) {
+        let i = listContent.currentIndex
+        for (let n = 0; n < options.length; n++) {
+            i += delta
+            if (i < 0 || i >= options.length)
+                break
+            if (optionMatches(i)) {
+                listContent.currentIndex = i
+                listContent.positionViewAtIndex(i, ListView.Contain)
+                return
+            }
+        }
+    }
+    function acceptSearchHighlight() {
+        const i = listContent.currentIndex
+        if (!optionMatches(i))
+            return
+        popup.close()
+        selectRoot.forceActiveFocus()
+        selectRoot.selected(i)
+    }
 
     Row {
         anchors.fill: parent
@@ -149,6 +203,7 @@ Rectangle {
         cursorShape: selectRoot.enabled ? Qt.PointingHandCursor : Qt.ArrowCursor
         onClicked: {
             if (selectRoot.enabled) {
+                selectRoot.forceActiveFocus()
                 selectRoot.openPopup()
             }
         }
@@ -214,7 +269,30 @@ Rectangle {
                             verticalAlignment: Text.AlignVCenter
                             clip: true
                             text: selectRoot.filter
-                            onTextChanged: selectRoot.filter = text
+                            onTextChanged: {
+                                selectRoot.filter = text
+                                if (!listContent)
+                                    return
+                                for (let i = 0; i < selectRoot.options.length; i++) {
+                                    if (selectRoot.optionMatches(i)) {
+                                        listContent.currentIndex = i
+                                        return
+                                    }
+                                }
+                                listContent.currentIndex = -1
+                            }
+                            Keys.onPressed: function (event) {
+                                if (event.key === Qt.Key_Down)
+                                    selectRoot.moveSearchHighlight(1)
+                                else if (event.key === Qt.Key_Up)
+                                    selectRoot.moveSearchHighlight(-1)
+                                else if (event.key === Qt.Key_Return
+                                         || event.key === Qt.Key_Enter)
+                                    selectRoot.acceptSearchHighlight()
+                                else
+                                    return
+                                event.accepted = true
+                            }
                         }
                         Text {
                             visible: searchInput.text === ""