[BpkCardV2] Fix spelling - change 'colour' to 'color' for US English consistency

[Copilot]

Corrects British English spelling ('colour') to US English spelling ('color') throughout BpkCardV2 component to maintain codebase consistency with US English standards.

Changes

Documentation and Comments:

• common-types.ts: Updated type documentation (3 instances)
• BpkCardV2.tsx: Updated JSDoc comments (1 instance)
• README.md: Updated component documentation (4 instances)
• CHANGELOG.md: Updated changelog entries (3 instances)
• stories.tsx: Updated Storybook descriptions (4 instances)

Total: 15 spelling corrections across 5 files.

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Remember to include the following changes:

• Ensure the PR title includes the name of the component you are changing so it's clear in the release notes for consumers of the changes in the version e.g [Clover-123][BpkButton] Updating the colour
• README.md (If you have created a new component)
• Component README.md
• Tests
• Accessibility tests
  • The following checks were performed:
    • Ability to navigate using a keyboard only
    • Zoom functionality (Deque University explanation):
      • The page SHOULD be functional AND readable when only the text is magnified to 200% of its initial size
      • Pages must reflow as zoom increases up to 400% so that content continues to be presented in only one column i.e. Content MUST NOT require scrolling in two directions (both vertically and horizontally)
    • Ability to navigate using a screen reader only
• Storybook examples created/updated
• For breaking changes or deprecating components/properties, migration guides added to the description of the PR. If the guide has large changes, consider creating a new Markdown page inside the component's docs folder and link it here

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