TEBEX-1212 - Allow more colour options to be configured

[Chilledson]

This pull request introduces updates to the payment method configuration and expands the supported color options for checkout customization. The most notable changes are the addition of a default payment method and an extended set of color names.

Checkout customization:

• Expanded the COLOR_NAMES array in src/checkout.ts to include new color options (background, surface, surface-variant, success, warning, error, green, red, fields, field-border).

[Copilot]

Pull request overview

This pull request expands the checkout customization capabilities by adding 10 new color configuration options to the COLOR_NAMES array, allowing developers to customize additional UI elements beyond just primary and secondary colors. The changes also include updates to example files demonstrating the use of the defaultPaymentMethod option with a hardcoded "paypal" value for demonstration purposes.

Key changes:

• Extended COLOR_NAMES array with 10 new color options for more granular UI customization
• Updated example files to demonstrate defaultPaymentMethod configuration
• Updated compiled distribution files to reflect source changes

Reviewed changes

Copilot reviewed 2 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/checkout.ts	Added 10 new color names to COLOR_NAMES array: background, surface, surface-variant, success, warning, error, green, red, fields, field-border
example/index.js	Added defaultPaymentMethod: "paypal" to configuration object for demonstration
example/dist/index.js	Added defaultPaymentMethod: "paypal" and updated endpoint to production URL
dist/types/checkout.d.ts	Updated TypeScript declaration to include new color names in COLOR_NAMES type
dist/tebex.mjs	Updated ESM bundle with new color names
dist/tebex.cjs	Updated CommonJS bundle with new color names

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