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/reusify/.github/workflows/ci.yml

@@ -0,0 +1,96 @@
+name: ci
+
+on: [push, pull_request]
+
+jobs:
+  legacy:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: ['0.10', '0.12', 4.x, 6.x, 8.x, 10.x, 12.x, 13.x, 14.x, 15.x, 16.x]
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install
+        run: |
+          npm install --production && npm install tape
+
+      - name: Run tests
+        run: |
+          npm run test
+
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 22.x]
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install
+        run: |
+          npm install
+
+      - name: Run tests
+        run: |
+          npm run test:coverage
+
+  types:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install
+        run: |
+          npm install
+
+      - name: Run types tests
+        run: |
+          npm run test:typescript
+
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install
+        run: |
+          npm install
+
+      - name: Lint
+        run: |
+          npm run lint