feat(book_properties): improve layout & accessibility

apps/client/src/widgets/ribbon_widgets/book_properties.ts

@@ -19,6 +19,7 @@ const TPL = /*html*/`
 
         .book-properties-container {
             display: flex;
+            align-items: center;
         }
 
         .book-properties-container > * {

apps/client/src/widgets/ribbon_widgets/book_properties_config.ts

@@ -48,7 +48,7 @@ export function renderBookProperty(property: BookProperty, note: FNote) {
                 }
             });
             $checkbox.prop("checked", note.hasOwnedLabel(property.bindToLabel));
-            $container.prepend($checkbox);
+            $label.prepend($checkbox);
             break;
         default:
             throw new Error(`Unknown property type: ${property.type}`);