Planer: Schild-Input auf change-Event umgestellt (kein Fokus-Verlust beim Tippen)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

js/planner.js

@@ -1110,7 +1110,7 @@ function renderInfoPanel(plan) {
 
     const shieldInput = el.querySelector('#plan-shield-k-input');
     if (shieldInput) {
-        shieldInput.addEventListener('input', () => {
+        shieldInput.addEventListener('change', () => {
             const val = parseFloat(shieldInput.value) || 0;
             updatePlan(plan.id, { shieldK: val > 0 ? val : null });
             refreshMechanicList(plan.id);