Fix emoji rendering in deployed documentation

Added CSS rules to ensure emojis (✅ ❌ etc.) render with proper
color and size in deployed documentation. The issue was missing
emoji font family declarations.

Changes:
- Added emoji font stack with color emoji support
- Applied emoji fonts to headings, tables, and content
- Ensured proper font-size for table emojis

This fixes the issue where emojis showed too small and without
color on the deployed site.

Author: escamoteur

docs/.vitepress/theme/custom.css

@@ -66,3 +66,23 @@ html:not(.dark) .diagram-light {
     margin-bottom: 0.5rem;
   }
 }
+
+/* Ensure emojis render correctly with color and proper size */
+/* This fixes the issue where ✅ ❌ and other emojis show too small or without color */
+:root {
+  /* Emoji font stack with color emoji support */
+  --emoji-font-family: "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji", sans-serif;
+}
+
+/* Apply emoji font to headings, tables, and general content */
+h1, h2, h3, h4, h5, h6,
+p, li, td, th,
+.vp-doc {
+  font-family: var(--vp-font-family-base), var(--emoji-font-family);
+}
+
+/* Ensure table emojis render at proper size */
+table td, table th {
+  font-size: 1em;
+  line-height: 1.5;
+}