Codex review R2: add motion-safe prefix to shake animation for reduced-motion a11y

Author: nedtwigg

lib/src/components/Pond.tsx

@@ -890,7 +890,7 @@ function SelectionOverlay({ apiRef, selectedId, selectedType, mode }: {
 
 export function KillConfirmCard({ char, onCancel, shaking }: { char: string; onCancel?: () => void; shaking?: boolean }) {
   return (
-    <div className={`bg-surface-raised border border-error/30 px-6 py-4 rounded-lg text-center shadow-lg${shaking ? ' animate-shake-x' : ''}`}>
+    <div className={`bg-surface-raised border border-error/30 px-6 py-4 rounded-lg text-center shadow-lg${shaking ? ' motion-safe:animate-shake-x' : ''}`}>
       <h2 className="text-base font-bold mb-3 text-foreground">Kill Session?</h2>
       <div className="bg-black py-2 px-6 rounded border border-border inline-block mb-2">
         <span className="text-xl font-bold text-error">{char}</span>