fix(metadata): restore editor mounting

Remove an unsupported shared-button property that invalidated the
workspace type lazily in both AlbumView and ephemeral surfaces.

cx

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

@@ -912,7 +912,6 @@ Item {
                         SettingsButton {
                             text: workspace.editor.tr("Apply to form")
                             iconName: "download"
-                            primary: true
                             minWidth: 0
                             onClicked: workspace.editor.applyRemote()
                         }

crates/qbz-qt/src/tag_editor_qt.rs

@@ -1850,5 +1850,9 @@ mod tests {
         assert!(workspace
             .contains("visible: QbzTagEditor.artworkSearching || QbzTagEditor.artworkLoading"));
         assert!(workspace.contains("id: lookupCard"));
+        // SettingsButton is the shared secondary settings control and has no
+        // `primary` property. An unknown assignment invalidates the entire QML
+        // type lazily, so neither AlbumView nor ephemeral can mount the editor.
+        assert!(!workspace.contains("primary: true"));
     }
 }