chore(data): add DEMO_TODAY anchor and use it for kanban day-counter

src/data/mockStore.jsx

@@ -2,6 +2,9 @@ import React, { createContext, useContext, useState, useEffect } from 'react';
 import { toast } from 'sonner';
 import { logger } from '../utils/logger';
 
+// Fixed "today" for the demo so seeded dates never go stale or land in the future.
+export const DEMO_TODAY = new Date('2026-05-29T12:00:00');
+
 // --- DATA CONSTANTS (Extracted from old App.jsx) ---
 
 const RAW_LOCATIONS = [