refactor(plan): commit category color on blur to avoid PATCH/audit spam

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/components/PlanCategoriesModal.tsx

@@ -85,9 +85,18 @@ export default function PlanCategoriesModal({
             <input
               type="color"
               className="plan-cat-color"
-              value={c.color}
+              // Uncontrolled + patch on blur (like the rename input): the
+              // native color picker fires onChange on every drag tick, which
+              // would spam PATCH requests and the audit log. onBlur commits
+              // once when the picker closes.
+              defaultValue={c.color}
+              key={c.color}
               disabled={busy}
-              onChange={(e) => patch(c.id, { color: e.target.value })}
+              onBlur={(e) => {
+                if (e.target.value !== c.color) {
+                  patch(c.id, { color: e.target.value });
+                }
+              }}
               aria-label={`Barva – ${c.label}`}
             />
             <input