feat(templates): enrichUI with Tailwind styling and messaging component improvements

- Add custom border, background, and spacing utilities to base template
- Enhance message notification styling and layout
- Update delete modal button appearance and behavior
- Refine comment card component with Tailwind classes and responsive behavior
- Adjust sidebar responsiveness for mobile view

templates/base.html

@@ -14,11 +14,46 @@
     <script src="https://cdn.jsdelivr.net/npm/quill@2.0.2/dist/quill.min.js"></script>
     {% load static tailwind_cli %}
     {% tailwind_css %}
-    <style>[x-cloak] { display: none !important; }</style>
+    <style>
+        [x-cloak] { display: none !important; }
+
+        .border-subtle { border-color: rgba(0,0,0,0.06); }
+        .border-soft { border-color: rgba(0,0,0,0.10); }
+        .border-emphasis { border-color: rgba(0,0,0,0.18); }
+
+        .bg-canvas { background-color: #f6f8fa; }
+        .bg-elevated { background-color: #ffffff; }
+        .bg-hover { background-color: rgba(0,0,0,0.03); }
+
+        .stat-card {
+            background: #fff;
+            border: 1px solid rgba(0,0,0,0.06);
+            border-radius: 12px;
+            padding: 20px;
+            transition: border-color 0.15s;
+        }
+        .stat-card:hover { border-color: rgba(59,130,246,0.25); }
+
+        .card-surface {
+            background: #fff;
+            border: 1px solid rgba(0,0,0,0.06);
+            border-radius: 12px;
+        }
+
+        .text-primary { color: #0b1c33; }
+        .text-secondary { color: #3c4a5c; }
+        .text-tertiary { color: #6b7a8e; }
+        .text-muted { color: #9ca3af; }
+
+        @media (max-width: 1023px) {
+            .sidebar-mobile { transform: translateX(-100%); }
+            .sidebar-mobile.mobile-open { transform: translateX(0); }
+        }
+    </style>
     {% block extra_head %}{% endblock %}
 </head>
-<body class="min-h-screen bg-gray-50" x-data="{ sidebarOpen: false }">
+<body class="min-h-screen bg-canvas antialiased" x-data="{ sidebarOpen: false }">
     {% block content %}{% endblock %}
     {% block extra_scripts %}{% endblock %}
 </body>
-</html>
+</html>