feat: use theme color to highlight selected search item

[cscnk52]

Description

use theme color to highlight selected search item

also fix an eslint problem

PR Type

• [x] Feature
• [ ] Bugfix
• [ ] Hotfix
• [ ] Other (please describe):

Screenshots (if UI change)

Demo Video (if new feature)

Linked Issues

Additional context

Changelog

• [ ] I have updated the changelog/next.md with my changes.

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Suggested PR Title:

feat(panel/cmdk): improve theme color usage and semantics

Change Summary: Updated panel command search UI by replacing hardcoded hover and selection background classes with theme-based classes for better consistency across themes. Also wrapped the local mode search result text in a for semantic clarity and potential styling flexibility. These changes enhance UI theming and improve code readability.

Code Review: No change requests necessary.

[Innei]

I plan to refactor the entire cmdk panel, so this PR is temporarily shelved.