feat(ui): enable React Compiler

[Tanmay-008]

Summary

This PR begins the migration of Motia UI from manual memoization (memo, useMemo, useCallback) to React Compiler.

React Compiler is enabled for the UI layer as the first step of the migration, establishing a stable foundation before rolling it out across the rest of the codebase.

Related Issues

Closes #940

Changes Included

• Added babel-plugin-react-compiler as a dev dependency
• Enabled the compiler via Vite config in packages/ui/vite.config.ts

react({
  babel: {
    plugins: ['babel-plugin-react-compiler'], 
  },
}); 

⚠️ Note

Phase 1 only activates the React Compiler. Further phases (if required) will focus on cleanup and performance validation.

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