Initial commit: notification-elements-demo app

Interactive Angular 19 demo for @sda/notification-elements-ui with
6 sections: Bell & Feed, Notification Center, Inbox, Comments &
Threads, Mention Input, and Full-Featured layout. Includes mock
data, dark mode toggle, and real-time event log.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

node_modules/pacote/lib/util/add-git-sha.js

@@ -0,0 +1,15 @@
+// add a sha to a git remote url spec
+const addGitSha = (spec, sha) => {
+  if (spec.hosted) {
+    const h = spec.hosted
+    const opt = { noCommittish: true }
+    const base = h.https && h.auth ? h.https(opt) : h.shortcut(opt)
+
+    return `${base}#${sha}`
+  } else {
+    // don't use new URL for this, because it doesn't handle scp urls
+    return spec.rawSpec.replace(/#.*$/, '') + `#${sha}`
+  }
+}
+
+module.exports = addGitSha