feat(docs): add light-mode-code setting to docs.yml

[jon-fern]

Description

Refs: Companion PR to fern-api/fern-platform#6225

Adds a new light-mode-code setting to docs.yml that forces code blocks to display in light mode regardless of the selected theme. This is the inverse of the existing dark-mode-code setting.

Changes Made

• Added light-mode-code property to DocsSettingsConfig in the docs.yml API definition
• Added lightModeCode to the TypeScript API type with JSDoc documentation
• Added serialization support mapping light-mode-code (YAML) to lightModeCode (TypeScript)
• Updated parseDocsConfiguration to include the new setting with default value false
• Added changelog entry for version 3.36.0

Usage

# docs.yml
settings:
  light-mode-code: true  # Forces light code blocks even in dark mode

Testing

• Lint checks pass (pnpm run check)
• Manual testing completed (requires fern-platform PR to be merged first)

Human Review Checklist

• Verify the new setting follows the same pattern as dark-mode-code
• Verify serialization correctly maps kebab-case to camelCase
• Coordinate merge timing with fern-platform PR chore(csharp): update csharp-model seed #6225

---

Link to Devin run: https://app.devin.ai/sessions/c0ff290bf09844f79c4ff090e370dd59
Requested by: @jon-fern

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[chatgpt-codex-connector]

Add schema support for light-mode-code

The new lightModeCode field added here won’t ever make it through docs loading because packages/cli/workspace/loader/src/docs-yml.schema.json still lists only search-text, disable-search, dark-mode-code, default-search-filters, etc. under DocsSettingsConfig with additionalProperties: false, so a docs.yml that sets settings.light-mode-code will fail schema validation before parsing. Regenerate or update the schema to include light-mode-code so the new setting can be used.

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