fix: Resolve vue-tsc -b errors in KitsView and TimedExecuteView

KitsView: cast v-for Items array to fix string|number index type mismatch.
TimedExecuteView: remove unused X icon import.

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

frontend/src/views/admin/TimedExecuteView.vue

@@ -9,7 +9,6 @@ import {
   Trash2,
   Clock,
   Settings as SettingsIcon,
-  X,
   UserPlus,
   UserMinus,
 } from 'lucide-vue-next'