Migrate Menu component from emotion styled-components to vanilla-extract

[Copilot]

This PR migrates the Menu component and its subcomponents from emotion styled-components to vanilla-extract CSS-in-JS, following the established pattern used by other components like Button and Text.

Changes Made

Created styles.css.ts

• Comprehensive vanilla-extract recipes for all Menu styling needs
• styledPopup recipe with searchable variant for the main popup container
• itemContainer, styledItem, and styledLinkItem recipes handling sentiment variants (neutral, primary, danger) and disabled states
• groupContainer style for menu groups
• Proper CSS selector handling for hover states, focus states, and SVG icon styling

Updated Component Files

• MenuContent.tsx: Replaced 5 styled-components with vanilla-extract classes while preserving dynamic height calculations and search functionality
• Item.tsx: Replaced complex itemCoreStyle function and 3 styled-components with clean vanilla-extract recipes
• Group.tsx: Replaced styled Container with vanilla-extract class

Benefits

• Zero breaking changes - Component API remains identical with all props preserved
• Better performance - Vanilla-extract generates optimized CSS at build time
• Type safety - Full TypeScript support for all style variants through recipe system
• Consistency - Aligns with project's vanilla-extract migration strategy
• Maintainability - Cleaner separation of styles from component logic

Functionality Preserved

All existing Menu functionality remains intact:

• Hover, focus, and active states for all sentiment variations
• Keyboard navigation and accessibility features
• Searchable menu functionality
• Dynamic positioning and sizing
• Nested menu support
• Link and button item variants

The migration maintains complete backward compatibility while modernizing the styling approach. Test snapshots will need updating due to CSS class name changes, but all functional behavior is preserved.

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[changeset-bot]

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Latest commit: 4a3c29b

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