fix(qt): keep the Local Library select button clear of the search box

The expandable search keeps a 30px footprint and grows its inner field
LEFT (QbzLineEdit.qml, `x: root.width - width`), so anything positioned
before it in the row is covered while the search is open and cannot be
clicked. On the Tracks tab the multi-select button led the row and was
exactly that.

Moved to the end of the group — the slot the Albums tab already puts it
in, so the two tabs agree as well.

Swept the other nine expandable searches: in all of them the field is
already the first child of its row, and the tree rail's box width is
computed to stop at the third button. Tracks was the only case.

cc

crates/qbz-qt/qml/views/local/LocalToolbar.qml

@@ -198,11 +198,6 @@ Row {
         spacing: 8
         height: parent.height
 
-        QbzNavButton {
-            anchors.verticalCenter: parent.verticalCenter
-            name: "square-check-big"
-            onClicked: root.view.toggleTracksMultiSelect()
-        }
         LocalSearchBox {
             anchors.verticalCenter: parent.verticalCenter
             placeholder: QbzSession.tr("Search", QbzSession.trRev)
@@ -241,6 +236,17 @@ Row {
             // grouping is a client-side reorder, not a new ORDER BY.
             onSelected: function (i) { QbzLocal.tracksSetGroup(root.tracksGroupIds[i]) }
         }
+        // Multi-select LAST — never to the LEFT of a search box. The expandable
+        // field keeps a 30px footprint and grows its inner box LEFT
+        // (QbzLineEdit.qml:157-161, `x: root.width - width`), so anything
+        // positioned before it is covered while the search is open and cannot
+        // be clicked. This button used to lead the row and was exactly that.
+        // Same slot the Albums group puts it in, so the two tabs also agree.
+        QbzNavButton {
+            anchors.verticalCenter: parent.verticalCenter
+            name: "square-check-big"
+            onClicked: root.view.toggleTracksMultiSelect()
+        }
     }
 
     // ============================ FOLDERS ================================