fix(compare): add min-w-0 to ColumnHeader per Greptile review

ColumnHeader (the Sim/competitor logo header cells in the two fr columns)
still had default min-width: auto, so an unusually long competitor name
could size the header to its min-content width and push the grid wider
than its column allows, same root cause as the rows already fixed.

Author: waleedlatif1

apps/sim/app/(landing)/comparison/components/comparison-table/comparison-table.tsx

@@ -55,12 +55,14 @@ function ColumnHeader({
   return (
     <div
       className={cn(
-        'flex flex-col items-center gap-2 border-[var(--border-1)] border-b px-3 py-4 text-center',
+        'flex min-w-0 flex-col items-center gap-2 border-[var(--border-1)] border-b px-3 py-4 text-center',
         isSim ? 'bg-[var(--surface-2)]' : 'bg-[var(--surface-1)]'
       )}
     >
       {iconTile}
-      <span className='font-medium text-[var(--text-primary)] text-base'>{name}</span>
+      <span className='w-full truncate font-medium text-[var(--text-primary)] text-base'>
+        {name}
+      </span>
     </div>
   )
 }