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/@jridgewell/resolve-uri/README.md

@@ -0,0 +1,40 @@
+# @jridgewell/resolve-uri
+
+> Resolve a URI relative to an optional base URI
+
+Resolve any combination of absolute URIs, protocol-realtive URIs, absolute paths, or relative paths.
+
+## Installation
+
+```sh
+npm install @jridgewell/resolve-uri
+```
+
+## Usage
+
+```typescript
+function resolve(input: string, base?: string): string;
+```
+
+```js
+import resolve from '@jridgewell/resolve-uri';
+
+resolve('foo', 'https://example.com'); // => 'https://example.com/foo'
+```
+
+| Input                 | Base                    | Resolution                     | Explanation                                                  |
+|-----------------------|-------------------------|--------------------------------|--------------------------------------------------------------|
+| `https://example.com` | _any_                   | `https://example.com/`         | Input is normalized only                                     |
+| `//example.com`       | `https://base.com/`     | `https://example.com/`         | Input inherits the base's protocol                           |
+| `//example.com`       | _rest_                  | `//example.com/`               | Input is normalized only                                     |
+| `/example`            | `https://base.com/`     | `https://base.com/example`     | Input inherits the base's origin                             |
+| `/example`            | `//base.com/`           | `//base.com/example`           | Input inherits the base's host and remains protocol relative |
+| `/example`            | _rest_                  | `/example`                     | Input is normalized only                                     |
+| `example`             | `https://base.com/dir/` | `https://base.com/dir/example` | Input is joined with the base                                |
+| `example`             | `https://base.com/file` | `https://base.com/example`     | Input is joined with the base without its file               |
+| `example`             | `//base.com/dir/`       | `//base.com/dir/example`       | Input is joined with the base's last directory               |
+| `example`             | `//base.com/file`       | `//base.com/example`           | Input is joined with the base without its file               |
+| `example`             | `/base/dir/`            | `/base/dir/example`            | Input is joined with the base's last directory               |
+| `example`             | `/base/file`            | `/base/example`                | Input is joined with the base without its file               |
+| `example`             | `base/dir/`             | `base/dir/example`             | Input is joined with the base's last directory               |
+| `example`             | `base/file`             | `base/example`                 | Input is joined with the base without its file               |