fix dark mode issue

app/src/content/embeds/experiment-overview.html

@@ -164,8 +164,8 @@
                     const isDark = document.documentElement.getAttribute('data-theme') === 'dark';
                     const textColor = isDark ? 'rgba(255,255,255,0.78)' : 'rgba(0,0,0,0.68)';
                     const mutedText = isDark ? 'rgba(255,255,255,0.35)' : 'rgba(0,0,0,0.30)';
-                    const linkOpacity = isDark ? 0.20 : 0.18;
-                    const linkHoverOpacity = isDark ? 0.50 : 0.45;
+                    const linkOpacity = isDark ? 0.20 : 0.35;
+                    const linkHoverOpacity = isDark ? 0.50 : 0.65;
                     const fontSize = Math.max(10, Math.min(14, width / 65));
 
                     const ml = width * 0.005, mr = width * 0.01;
@@ -362,6 +362,7 @@
 
                 if (window.ResizeObserver) new ResizeObserver(() => render()).observe(container);
                 else window.addEventListener('resize', render);
+                new MutationObserver(() => render()).observe(document.documentElement, { attributes: true, attributeFilter: ['data-theme'] });
                 render();
             }
         };