fix: compact messages align left with first message, no indent gap

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/colony/src/components/MessageItem.tsx

@@ -112,7 +112,7 @@ export function MessageItem({ message, compact, replyTarget, onSelect, onDelete,
         </button>
       )}
 
-      <div className={cn("px-4 md:px-5", compact ? "py-0.5 pl-[52px] md:pl-[56px]" : "py-3 md:py-4")}>
+      <div className={cn("px-4 md:px-5", compact ? "py-0.5" : "py-3 md:py-4")}>
         {/* Header — hidden in compact mode */}
         {!compact && <div className="flex items-center gap-2.5 text-[11px] flex-wrap">
           {/* Avatar — ape emoji with OKLCH color, agents get first letter */}