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/webpack-merge/dist/index.d.ts

@@ -0,0 +1,15 @@
+import unique from "./unique";
+import { CustomizeRule, CustomizeRuleString, ICustomizeOptions, Key } from "./types";
+declare function merge<Configuration extends object>(firstConfiguration: Configuration | Configuration[], ...configurations: Configuration[]): Configuration;
+declare function mergeWithCustomize<Configuration extends object>(options: ICustomizeOptions): (firstConfiguration: Configuration | Configuration[], ...configurations: Configuration[]) => Configuration;
+declare function customizeArray(rules: {
+    [s: string]: CustomizeRule | CustomizeRuleString;
+}): (a: any, b: any, key: Key) => any;
+type Rules = {
+    [s: string]: CustomizeRule | CustomizeRuleString | Rules;
+};
+declare function mergeWithRules(rules: Rules): (firstConfiguration: object | object[], ...configurations: object[]) => object;
+declare function customizeObject(rules: {
+    [s: string]: CustomizeRule | CustomizeRuleString;
+}): (a: any, b: any, key: Key) => any;
+export { customizeArray, customizeObject, CustomizeRule, merge, merge as default, mergeWithCustomize, mergeWithRules, unique, };