showcase: add back the scoped-custom-element-registry

the scoped mixin no longer depends on it directly

toolkit-showcase/package.json

@@ -52,6 +52,7 @@
         "@dbp-toolkit/resource-select": "^0.1.0",
         "@open-wc/scoped-elements": "^2.1.0",
         "@rollup/plugin-replace": "^4.0.0",
+        "@webcomponents/scoped-custom-element-registry": "^0.0.5",
         "highlight.js": "^11.0.0",
         "lit": "^2.0.0"
     },

toolkit-showcase/src/dbp-toolkit-showcase.js

+import '@webcomponents/scoped-custom-element-registry';
 import {AppShell} from '@dbp-toolkit/app-shell';
 import * as commonUtils from '@dbp-toolkit/common/utils';
 

yarn.lock

@@ -2174,6 +2174,11 @@
   resolved "https://registry.yarnpkg.com/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz#aa58042711d6e3275dd37dc597e5d31e8c290a44"
   integrity sha512-sL/cEvJWAnClXw0wHk85/2L0G6Sj8UB0Ctc1TEMbKSsmpRosqhwj9gWgFRZSrBr2f9tiXISwNhCPmlfqUqyb9Q==
 
+"@webcomponents/scoped-custom-element-registry@^0.0.5":
+  version "0.0.5"
+  resolved "https://registry.yarnpkg.com/@webcomponents/scoped-custom-element-registry/-/scoped-custom-element-registry-0.0.5.tgz#96377f6a5587c76479b90d13deb7674b51b82603"
+  integrity sha512-vtlIyf+b657A1MWY69uTTJaGYwqUS3Lnm0+n2vLyuVf5MYOwSOB3Mx42AyBxz/6t9gw+IDelm1HQFOiA1xZCEQ==
+
 "@yarn-tool/resolve-package@^1.0.40":
   version "1.0.46"
   resolved "https://registry.yarnpkg.com/@yarn-tool/resolve-package/-/resolve-package-1.0.46.tgz#db7354380e5ca7682294af59e5ab0f7fce640ac1"