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/find-up/package.json

@@ -0,0 +1,56 @@
+{
+	"name": "find-up",
+	"version": "6.3.0",
+	"description": "Find a file or directory by walking up parent directories",
+	"license": "MIT",
+	"repository": "sindresorhus/find-up",
+	"funding": "https://github.com/sponsors/sindresorhus",
+	"author": {
+		"name": "Sindre Sorhus",
+		"email": "sindresorhus@gmail.com",
+		"url": "https://sindresorhus.com"
+	},
+	"type": "module",
+	"exports": "./index.js",
+	"engines": {
+		"node": "^12.20.0 || ^14.13.1 || >=16.0.0"
+	},
+	"scripts": {
+		"test": "xo && ava && tsd"
+	},
+	"files": [
+		"index.js",
+		"index.d.ts"
+	],
+	"keywords": [
+		"find",
+		"up",
+		"find-up",
+		"findup",
+		"look-up",
+		"look",
+		"file",
+		"search",
+		"match",
+		"package",
+		"resolve",
+		"parent",
+		"parents",
+		"folder",
+		"directory",
+		"walk",
+		"walking",
+		"path"
+	],
+	"dependencies": {
+		"locate-path": "^7.1.0",
+		"path-exists": "^5.0.0"
+	},
+	"devDependencies": {
+		"ava": "^3.15.0",
+		"is-path-inside": "^4.0.0",
+		"tempy": "^2.0.0",
+		"tsd": "^0.17.0",
+		"xo": "^0.44.0"
+	}
+}