fix: coupon removal button and duplicate field ID on checkout form (#76)

[superdav42]

Summary

Fixes two bugs reported in issue #76:

1. Remove button does nothing — The "Remove" link in the order summary only set discount_code = '' but did not reset toggle_discount_code. This left the coupon input field visible and in an inconsistent state. The fix adds toggle_discount_code = false to the click handler so the coupon field collapses and the Vue watcher correctly triggers create_order() to recalculate totals.

2. Coupon code does not render correctly — The toggle checkbox (discount_code_checkbox) had id = 'discount_code', the same as the text input field. This produced a duplicate id="field-discount_code" in the rendered HTML, breaking the <label for="..."> association and causing rendering issues. Fixed by giving the toggle its own unique id: discount_code_checkbox.

Changes

• views/checkout/templates/order-summary/simple.php — extend click handler to also reset toggle_discount_code
• inc/checkout/signup-fields/class-signup-field-discount-code.php — fix duplicate HTML id on the toggle checkbox

Closes #76

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f9c4eb40-40d9-4523-a298-065baab6395d

📥 Commits

Reviewing files that changed from the base of the PR and between 5b40ee7 and bb91be1.

📒 Files selected for processing (2)

• inc/checkout/signup-fields/class-signup-field-discount-code.php
• views/checkout/templates/order-summary/simple.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bugfix/issue-76-coupon-removal-rendering

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