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/autoprefixer/lib/hacks/autofill.js

@@ -0,0 +1,26 @@
+let Selector = require('../selector')
+let utils = require('../utils')
+
+class Autofill extends Selector {
+  constructor(name, prefixes, all) {
+    super(name, prefixes, all)
+
+    if (this.prefixes) {
+      this.prefixes = utils.uniq(this.prefixes.map(() => '-webkit-'))
+    }
+  }
+
+  /**
+   * Return different selectors depend on prefix
+   */
+  prefixed(prefix) {
+    if (prefix === '-webkit-') {
+      return ':-webkit-autofill'
+    }
+    return `:${prefix}autofill`
+  }
+}
+
+Autofill.names = [':autofill']
+
+module.exports = Autofill