feat: Enhance development scripts and improve accessibility features

- Updated `package.json` to enhance the `dev` script for stopping processes before starting the development server.
- Added a new `dev:stop` script to streamline the process of killing conflicting processes.
- Improved accessibility in the UI by adjusting button styles and ensuring minimum touch target sizes.
- Refactored the `unlock-sdk-integration.test.ts` to conditionally skip integration tests based on an environment variable.
- Updated README to reflect changes in stopping development processes.

These changes improve the development workflow and enhance accessibility across the application.

Author: Oba-One

README.md

@@ -286,7 +286,7 @@ contracts/
 #### Port Conflicts
 - Client: Port 3000
 - Anvil: Port 8545
-- **Solution**: Kill conflicting processes with `pnpm stop`
+- **Solution**: Kill conflicting processes with `pnpm dev:stop`
 
 #### Contract Changes Not Reflecting
 1. Check `contracts/anvil.log` for blockchain errors