fix(core): Use tax-inclusive amount when cancelling shipping with pricesIncludeTax

[BibiSebi]

Summary

• When cancelling an order with cancelShipping=true and pricesIncludeTax=true, the shipping cancellation adjustment used the tax-exclusive discountedPrice instead of the tax-inclusive discountedPriceWithTax
• This left a remainder equal to the tax amount on the shipping cost
• Now uses discountedPriceWithTax when listPriceIncludesTax=true so the adjustment fully zeroes out shipping

Test plan

• Added e2e test: cancels order with pricesIncludeTax=true and verifies shipping, shippingWithTax, and totalWithTax are all 0
• Existing cancellation by orderId tests still pass

Fixes #4348

[vercel]

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Project	Deployment	Actions	Updated (UTC)
vendure-storybook	Ready	Preview, Comment	Feb 17, 2026 1:16pm

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/oss-360-cancel-order-shipping-tax-remainder

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