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/icss-utils/CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [5.1.0] - 2020-11-19
+
+### Features
+
+- feat: support at-rule versions of `import`/`export`
+
+## [5.0.0] - 2020-10-12
+
+### BREAKING CHANGE
+
+- minimum supported `postcss` version is `^8.1.0`
+
+### Fixes
+
+- minimum supported `Node.js` version is `^10 || ^12 || >= 14`
+- compatibility with PostCSS 8
+
+## [5.0.0-rc.0] - 2020-09-21
+
+### BREAKING CHANGE
+
+- minimum supported `Node.js` version is `>= 10.13.0 || >= 12.13.0 || >= 14`
+- minimum supported `postcss` version is `^8.0.0`
+- `postcss` was moved to `peerDependencies`, you need to install `postcss` in your project before use the plugin
+- you need to pass `postcss` API to using `createICSSRules` (third argument)