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/lib/rules/BasicMatcherRulePlugin.js

@@ -0,0 +1,54 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("../../declarations/WebpackOptions").RuleSetRule} RuleSetRule */
+/** @typedef {import("./RuleSetCompiler")} RuleSetCompiler */
+/** @typedef {import("./RuleSetCompiler").RuleCondition} RuleCondition */
+
+class BasicMatcherRulePlugin {
+	/**
+	 * @param {string} ruleProperty the rule property
+	 * @param {string=} dataProperty the data property
+	 * @param {boolean=} invert if true, inverts the condition
+	 */
+	constructor(ruleProperty, dataProperty, invert) {
+		this.ruleProperty = ruleProperty;
+		this.dataProperty = dataProperty || ruleProperty;
+		this.invert = invert || false;
+	}
+
+	/**
+	 * @param {RuleSetCompiler} ruleSetCompiler the rule set compiler
+	 * @returns {void}
+	 */
+	apply(ruleSetCompiler) {
+		ruleSetCompiler.hooks.rule.tap(
+			"BasicMatcherRulePlugin",
+			(path, rule, unhandledProperties, result) => {
+				if (unhandledProperties.has(this.ruleProperty)) {
+					unhandledProperties.delete(this.ruleProperty);
+					const value =
+						rule[/** @type {keyof RuleSetRule} */ (this.ruleProperty)];
+					const condition = ruleSetCompiler.compileCondition(
+						`${path}.${this.ruleProperty}`,
+						value
+					);
+					const fn = condition.fn;
+					result.conditions.push({
+						property: this.dataProperty,
+						matchWhenEmpty: this.invert
+							? !condition.matchWhenEmpty
+							: condition.matchWhenEmpty,
+						fn: this.invert ? v => !fn(v) : fn
+					});
+				}
+			}
+		);
+	}
+}
+
+module.exports = BasicMatcherRulePlugin;