Fix long lists disappearing until browser zoom change

Change .card overflow from hidden to visible. The hidden overflow
caused Chrome to miscalculate paint regions for containers with
many child elements (chart of accounts, rules, etc.), resulting
in content being invisible until a repaint was triggered.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/assets/css/main.css

@@ -563,7 +563,7 @@ code {
     border: 1px solid var(--border-light);
     box-shadow: var(--shadow-sm);
     margin-bottom: 0;
-    overflow: hidden;
+    overflow: visible;
     transition: box-shadow var(--duration-normal) var(--ease-out),
                 transform var(--duration-normal) var(--ease-out),
                 border-color var(--duration-normal) ease;