feat: add smaller font-size styling for tables in md-render

- Set table font-size to 0.85em for improved readability
- Add professional table styling with borders and spacing
- Include header styling with background color and bold text
- Enhance visual hierarchy in generated HTML documents

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

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

markitect/clean_document_manager.py

@@ -174,6 +174,22 @@ class CleanDocumentManager:
                 padding-left: 1rem;
                 color: #6a737d;
             }
+            table {
+                font-size: 0.85em;
+                border-collapse: collapse;
+                margin: 1rem 0;
+                width: 100%;
+            }
+            th, td {
+                font-size: inherit;
+                border: 1px solid #dfe2e5;
+                padding: 0.5rem;
+                text-align: left;
+            }
+            th {
+                background: #f6f8fa;
+                font-weight: 600;
+            }
         </style>
         """