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/adjust-sourcemap-loader/codec/npm-module.js

@@ -0,0 +1,35 @@
+'use strict';
+
+var path = require('path'),
+    fs   = require('fs');
+
+var loaderUtils = require('loader-utils');
+
+var getContextDirectory = require('./utility/get-context-directory');
+
+/**
+ * Codec for relative paths with respect to the context directory.
+ * @type {{name:string, decode: function}}
+ */
+module.exports = {
+  name  : 'npmModule',
+  decode: decode
+};
+
+/**
+ * Decode the given uri.
+ * Include only module paths containing `~`.
+ * @this {{options: object}} A loader or compilation
+ * @param {string} uri A source uri to decode
+ * @returns {boolean|string} False where unmatched else the decoded path
+ */
+function decode(uri) {
+  /* jshint validthis:true */
+  if (/~/.test(uri)) {
+    var relative = loaderUtils.urlToRequest(uri),
+        base     = getContextDirectory.call(this),
+        absFile  = path.normalize(path.join(base, 'node_modules', relative)),
+        isValid  = !!absFile && fs.existsSync(absFile) && fs.statSync(absFile).isFile();
+    return isValid && absFile;
+  }
+}