feat(plan): resolveCell/resolveGrid return arrays; dashboard shows up to 3

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

src/admin/pages/Dashboard.tsx

@@ -72,7 +72,7 @@ interface DashData {
   pending_orders?: number;
   unpaid_invoices?: number;
   pending_leave_requests?: number;
-  today_plan?: TodayPlan | null;
+  today_plan?: TodayPlan[];
   [key: string]: unknown;
 }
 
@@ -325,7 +325,7 @@ export default function Dashboard() {
       {!dashLoading &&
         (hasPermission("attendance.record") ||
           hasPermission("attendance.manage")) && (
-          <DashTodayPlan plan={dashData?.today_plan ?? null} />
+          <DashTodayPlan plans={dashData?.today_plan ?? []} />
         )}
 
       {/* Quick actions */}