fix(core,dashboard): make coupon code validation case-insensitive

[Jeffrey-manzl]

Description

Coupon codes are now validated case-insensitively across the entire backend. Previously, a customer entering abc10 when the coupon code was ABC10 would get an "invalid coupon" error. This aligns Vendure with the behavior of other major e-commerce platforms (Shopify, WooCommerce).

Additionally, the Dashboard now auto-uppercases coupon code input for consistency.

Closes OSS-371

Changes:

• promotion.service.ts: Use LOWER() in DB query for case-insensitive coupon lookup
• promotion.entity.ts: Case-insensitive comparison in test() method
• order.service.ts: Case-insensitive applyCouponCode and removeCouponCode
• order-modifier.ts: Case-insensitive coupon code checks in order modification
• promotions_.$id.tsx: Auto-uppercase coupon code input in Dashboard
• order-promotion.e2e-spec.ts: Updated test to verify case-insensitive behavior

Breaking changes

No breaking changes. Coupon codes that previously required exact case matching will now match case-insensitively.

Screenshots

Checklist

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Project	Deployment	Actions	Updated (UTC)
vendure-storybook	Building	Preview, Comment	Feb 27, 2026 1:42pm

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