flex:1 and overflow-y:auto from the desktop rule made the column
greedily claim remaining height instead of shrink-wrapping content.

Assisted-by: Claude Opus 4.6 via Claude Code

diff --git a/public/css/app.css b/public/css/app.css
index ed1089b..bd0528d 100644
--- a/public/css/app.css
+++ b/public/css/app.css
@@ -681,6 +681,8 @@ button[type="submit"]:not(.complete-btn):hover {
   }
 
   .column-overdue {
+    flex: none;
+    overflow-y: visible;
     padding-inline: var(--space-s);
     padding-block-end: 0;
   }