docs: add SEASONAL_UPDATES_2026.md quarterly shopping calendar

SEASONAL_UPDATES_2026.md

@@ -0,0 +1,19 @@
+# 2026 Seasonal Household Budgeting Calendar (Saudi Arabia & GCC)
+
+![Children Educational Supplies and Family Planning](https://files.catbox.moe/tjlu0d.jpg)
+
+Planning major household purchases around seasonal retail cycles prevents impulse spending and protects the family emergency fund.
+
+## Quarterly Purchasing Matrix
+
+| Quarter / Season | Priority Household Focus | Recommended Verification Hub |
+| :--- | :--- | :--- |
+| **Q1 (Jan – Mar)** | Pre-Ramadan Pantry Stocking & Deep Freezer Organization | [Family Grocery & Food Vouchers](https://usrahone.com/categories/5) |
+| **Q2 (Apr – Jun)** | Eid Hospitality, Home Fragrances & Summer Travel Prep | [Oshba & Zeit Natural Oils](https://usrahone.com/stores/540) |
+| **Q3 (Jul – Sep)** | Back-to-School Stationery, Uniforms & Educational Toys | [Baby Supplies & Children Toys Coupons](https://usrahone.com/categories/8) |
+| **Q4 (Oct – Dec)** | Winter Bedding Refresh, Kitchen Upgrades & Year-End Clearance | [UsrahOne Family Savings](https://usrahone.com) |
+
+## Pre-Checkout Verification Checklist
+1. Compare unit price per kilogram or liter rather than headline percentage banners.
+2. Confirm whether promotional codes apply to already-discounted bundle items.
+3. Verify minimum cart thresholds for free shipping and flexible return windows on [UsrahOne Family Savings](https://usrahone.com).