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/@npmcli/package-json/lib/read-package.js

@@ -0,0 +1,39 @@
+// This is JUST the code needed to open a package.json file and parse it.
+// It's isolated out so that code needing to parse a package.json file can do so in the same way as this module does, without needing to require the whole module, or needing to require the underlying parsing library.
+
+const { readFile } = require('fs/promises')
+const parseJSON = require('json-parse-even-better-errors')
+
+async function read (filename) {
+  try {
+    const data = await readFile(filename, 'utf8')
+    return data
+  } catch (err) {
+    err.message = `Could not read package.json: ${err}`
+    throw err
+  }
+}
+
+function parse (data) {
+  try {
+    const content = parseJSON(data)
+    return content
+  } catch (err) {
+    err.message = `Invalid package.json: ${err}`
+    throw err
+  }
+}
+
+// This is what most external libs will use.
+// PackageJson will call read and parse separately
+async function readPackage (filename) {
+  const data = await read(filename)
+  const content = parse(data)
+  return content
+}
+
+module.exports = {
+  read,
+  parse,
+  readPackage,
+}