[feat] Add Chromatic GitHub Action for Storybook visual testing

- Add automated visual regression testing for Storybook components
- Configure workflow to run on main branch and PRs
- Auto-accept changes on main branch for baseline updates
- Uses build-storybook script for optimized builds

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/chromatic.yaml

@@ -0,0 +1,33 @@
+name: 'Chromatic'
+
+on:
+  push:
+    branches: [main, sno-storybook]
+  pull_request:
+    branches: [main]
+
+jobs:
+  chromatic-deployment:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Required for Chromatic baseline
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build Storybook and run Chromatic
+        uses: chromaui/action@latest
+        with:
+          projectToken: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}
+          buildScriptName: build-storybook
+          autoAcceptChanges: 'main' # Auto-accept changes on main branch
+          exitOnceUploaded: true # Don't wait for UI tests to complete