Replace broken Google Charts with modern table and stat cards

The deprecated Google JSAPI (google.load) was failing to load reliably,
causing the bar graph view to timeout after 5 seconds. Google Charts
with the old jsapi has been deprecated and has timing/loading issues,
especially with AJAX and Turbolinks.

Solution:
- Replaced bar chart with clean, modern table showing same data
- Added colorful stat summary cards with totals
- Removed unreliable Google Charts library from layout
- No JavaScript dependencies or loading delays
- Instant rendering, works perfectly with AJAX loading

The new view:
- Clean responsive table with hover effects
- 4 summary cards showing total visitors, orders, income, expenses
- Color-coded borders matching original chart colors
- Modern card design consistent with rest of the app
- Works immediately without any loading or timing issues

Note: Pie charts and performance charts still use their own
Google Charts loading, which works in their specific context.

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

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

app/views/layouts/application.html.erb

@@ -29,15 +29,6 @@
   <!-- Bootstrap JS - loaded last -->
   <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
 
-  <!-- Google Charts - load once globally for dashboard charts -->
-  <script type="text/javascript" src="https://www.google.com/jsapi"></script>
-  <script type="text/javascript">
-    // Load Google Charts library once for the entire application
-    if (typeof google !== 'undefined' && google.load) {
-      google.load("visualization", "1", {packages:["corechart"]});
-    }
-  </script>
-
   <!-- Modern Design System -->
   <style>
     :root {