refactor: Convert ticket views to use only Tailwind CSS

- Rewrite ticket show view to use pure Tailwind CSS classes
- Update color scheme from gray-* to slate-* for modern look
- Replace indigo gradients with violet for better consistency
- Enhance spacing, typography, and visual hierarchy
- Add ticket_view route and controller action for PDF-like display
- Implement responsive QR code display with proper sizing
- Update status badge colors for better semantic meaning
- Improve accessibility with better button layouts and focus states

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

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

app/assets/stylesheets/application.postcss.css

@@ -13,3 +13,16 @@
 
 /* Import pages */
 @import "pages/home";
+
+/* QR Code Styles */
+.qr-code-container {
+  @apply flex items-center justify-center;
+}
+
+.qr-code-container svg {
+  max-width: 100% !important;
+  max-height: 100% !important;
+  width: 208px !important;
+  height: 208px !important;
+  display: block !important;
+}