[adrianptrv]

Follow-up to this theming PR: IgniteUI/igniteui-theming#668

Description

Removed the local css-vars-from-theme() wrapper from src/styles/utilities/_overwrites.scss and replaced it with the new theme-markers() mixin.

Type of Change

• Refactoring (code improvements without functional changes)

Checklist

• My code follows the project's coding standards
• I have tested my changes locally

Waiting on

• igniteui-theming version that includes the theme-markers() mixin.

[Copilot]

🟢 Approval recommended

No active review issues are reported for the Sass theming changes.

No open issues 🎉

What changed in this PR

This PR simplifies the library’s Sass theming utilities by adopting the upstream theme-markers() mixin and removing the local wrapper.

Changes:

• Replace manually emitted root theme markers with theme-markers().
• Remove the local css-vars-from-theme() wrapper and expose the upstream mixin directly.
• Update igniteui-theming to ^30.2.0, with the lockfile resolving version 30.2.0.

File	Description
src/​styles/​utilities/​_overwrites.scss	Remove the local wrapper and its unused imports.
src/​styles/​utilities/​_index.scss	Forward all upstream theme mixins without hiding css-vars-from-theme.
src/​styles/​themes/​base/​_theme.scss	Use theme-markers() for root theme metadata.
package.json	Raise the theming dependency to ^30.2.0.
package-lock.json	Lock the updated theming dependency to 30.2.0.

_{Review effort: Balanced}