Fix: Add missing _color.less variables to schemas (fixes #542)

[swashbuck]

Fixes #542

Fix

• Added 8 missing LESS colour variables to both schema/theme.schema.json (modern, draft 2020-12) and properties.schema (legacy, draft-04)

Variables added from issue #542:

• body-background-color — added to _global section
• drawer-item-selected-underline — added to _drawer section
• pull-quote, pull-quote-inverted, pull-quote-border — added in new _pullQuote section
• shadow-opacity — added to _misc section (as text input, not colour picker, since it accepts a percentage value e.g. 50%)

Additional missing variables identified during review:

• tooltip-color, tooltip-text-color — added in new _tooltip section

Testing

1. Load the course in the Adapt Authoring Tool
2. Navigate to Theme settings → Colours
3. Verify the following new fields appear in their respective sections:
   • Global: Body background colour
   • Drawer: Drawer item colour - selected underline
   • Pull Quote (new section): Pull quote background colour, Pull quote text colour, Pull quote border colour
   • Miscellaneous: Shadow opacity (text input)
   • Tooltip (new section): Tooltip background colour, Tooltip text colour
4. Set values for each and confirm they override the corresponding LESS variables in the built output

[kirsty-hames]

👀

[github-actions]

🎉 This PR is included in version 9.36.0 🎉

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