fix: ensure filter popover z-index above pinned columns

src/components/ColumnFilterPopover.tsx

@@ -162,7 +162,7 @@ export function ColumnFilterPopover({
         "absolute top-full left-0 mt-1 w-72 bg-slate-800 border border-slate-700 rounded-lg shadow-2xl p-3 flex flex-col gap-3 animate-in fade-in zoom-in-95 duration-100",
         className
       )}
-      style={{ zIndex }}
+      style={{ zIndex: zIndex >= 200 ? 9999 : zIndex }}
       onClick={(e) => e.stopPropagation()}
     >
       <button