refactor: move all color related code into separate file

[opheliagoldstein]

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[opheliagoldstein]

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Pull Request Overview

This PR refactors the codebase by extracting all color-related functionality from the main utils.js file into a dedicated color.js module for better code organization and separation of concerns.

Key changes:

• Created a new src/common/color.js file containing all color utilities and theme functions
• Removed color-related exports from src/common/utils.js and src/common/index.js
• Updated import statements across test files and card modules to use the new color module

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/common/color.js	New module containing all color utilities: isValidHexColor, isValidGradient, fallbackColor, and getCardColors
src/common/utils.js	Removed color functions and updated JSDoc type reference for theme parameter
src/common/index.js	Removed color-related exports from main index
tests/utils.test.js	Updated import to use new color module for getCardColors
tests/card.test.js	Updated import to use new color module for getCardColors
src/cards/*.js	Updated imports across card modules to use new color module
scripts/preview-theme.js	Updated import to use new color module for validation functions

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