fix(tokens): update code-color token to meet WCAG AA contrast

[e0d]

The light theme code-color token (#E83E8C) failed WCAG 1.4.3 contrast requirements, achieving 3.81:1 on white and 3.56:1 on off-white backgrounds — both below the 4.5:1 minimum for normal-weight text.

Updated color.code.base to reference {color.brand.500} rather than a raw hex value. This resolves the contrast failure (#9D0054, ~9:1 on white) and aligns with the established pattern of component tokens referencing palette tokens (e.g. success → green, info → teal). It also ensures that theme overrides to brand-500 automatically propagate to inline code text color.

Compiled output: --pgn-color-code-base: var(--pgn-color-brand-500)

Identified via WCAG 2.2 AA audit using static source analysis and automated page scanning (OpenEdX_ActionRowComp.pdf, 01 May 26).

AI assistance: Code change, contrast analysis, and token architecture review developed with Claude (claude-sonnet-4-6). Conversation informed the audit findings, color selection, and token pipeline tracing.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.40%. Comparing base (51702d5) to head (7a58021).

Additional details and impacted files

@@              Coverage Diff              @@
##           release-23.x    #4269   +/-   ##
=============================================
  Coverage         94.40%   94.40%           
=============================================
  Files               242      242           
  Lines              4309     4309           
  Branches           1020     1020           
=============================================
  Hits               4068     4068           
  Misses              237      237           
  Partials              4        4           

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