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/default-browser-id/index.js

@@ -0,0 +1,25 @@
+import {promisify} from 'node:util';
+import process from 'node:process';
+import {execFile} from 'node:child_process';
+
+const execFileAsync = promisify(execFile);
+
+export default async function defaultBrowserId() {
+	if (process.platform !== 'darwin') {
+		throw new Error('macOS only');
+	}
+
+	const {stdout} = await execFileAsync('defaults', ['read', 'com.apple.LaunchServices/com.apple.launchservices.secure', 'LSHandlers']);
+
+	// `(?!-)` is to prevent matching `LSHandlerRoleAll = "-";`.
+	const match = /LSHandlerRoleAll = "(?!-)(?<id>[^"]+?)";\s+?LSHandlerURLScheme = (?:http|https);/.exec(stdout);
+
+	const browserId = match?.groups.id ?? 'com.apple.Safari';
+
+	// Correct the case for Safari's bundle identifier
+	if (browserId === 'com.apple.safari') {
+		return 'com.apple.Safari';
+	}
+
+	return browserId;
+}