Replace @import with @use for theme styles

[prashant2007-wq]

Description

Fixes #2781

This PR addresses the Sass deprecation warnings by migrating from @import to @use in the color-modes module.

Changes

• Replaced all @import statements with @use in src/color-modes/index.scss
• This removes Sass deprecation warnings for @import directives
• Follows the modern Sass module system best practices

Related Issue

Closes #2781

Testing

• Verified that the styles compile without deprecation warnings
• Confirmed that the color modes still work as expected

[changeset-bot]

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Latest commit: 36222f6

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[francinelucca]

Thanks for the PR @prashant2007-wq , we've attempted this approach before but determined this migration will need more in-depth work to be compatible with our internal systems, so closing the PR and leaving the issue open for now