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/ajv/dist/compile/names.d.ts

@@ -0,0 +1,20 @@
+import { Name } from "./codegen";
+declare const names: {
+    data: Name;
+    valCxt: Name;
+    instancePath: Name;
+    parentData: Name;
+    parentDataProperty: Name;
+    rootData: Name;
+    dynamicAnchors: Name;
+    vErrors: Name;
+    errors: Name;
+    this: Name;
+    self: Name;
+    scope: Name;
+    json: Name;
+    jsonPos: Name;
+    jsonLen: Name;
+    jsonPart: Name;
+};
+export default names;