chore: upgrade kit to React 19 and update dependencies

[purnasth]

Checklist: Adopting New React 19 Features (Project-Ready)

This checklist is tailored for your codebase, which is already compatible with React 19. Use it to incrementally adopt new React 19 features and modernize further as needed. For each item, consult the official React 19 documentation and migration guide for details and best practices.

Closes issue #1

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1. General Preparation

• All dependencies (including React, React DOM, and related libraries) are updated to versions compatible with React 19.
• Third-party libraries reviewed for React 19 support.

2. New Features & APIs (Optional/Incremental)

• Actions API
  • Explore and adopt the new Actions API for handling form submissions and server mutations (if needed in your app).
• New Hooks
  • Review and adopt new hooks introduced in React 19 (e.g., useOptimistic, useActionState, etc.) where beneficial.
• Suspense Improvements
  • Use Suspense for data fetching and async boundaries, taking advantage of React 19's improved support, if your app requires it.
• Server Components (if using SSR)
  • Explore React Server Components for improved server-side rendering and data loading (if your app uses SSR).
• Concurrent Features
  • Consider using concurrent rendering features for smoother UI updates and transitions, if needed.

3. Code Modernization

• No deprecated APIs or patterns found (see React 19 migration guide).
• No class components present; all use function components and hooks.
• No legacy context API usage; all context uses modern API.

4. Testing & Validation

• All components tested for new warnings or errors in development mode (no issues found).
• Async and data-fetching logic works as expected (no Suspense or new hooks used yet).
• Review accessibility and performance if/when adopting new features.

5. Documentation

• Project documentation updated for React 19 compatibility.
• Add code comments or guides for any new patterns adopted as you incrementally use React 19 features.

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References:

• React 19 Release Notes
• React 19 Migration Guide
• React Docs

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Check off each item as you modernize your codebase and adopt React 19 features!