convert donation-examples to ts

[Amira1502]

Summary
This PR converts the entire hello-near-examples frontend from JavaScript to TypeScript. All pages, components, and wallet integrations have been updated to use the new near-selector package instead of wallet-selector.

Changes

• Renamed .js files to .ts or .tsx.
• Added TypeScript types for components, pages, and props.
• Added declarations.d.ts for SVG imports.
• Updated wallet/web3modal files to include proper TypeScript interfaces.
• Updated _app.tsx and index.tsx to comply with TypeScript and Next.js requirements.
• Removed dependencies: wallet-selector, viem, wagmi, and reown.
• Udated wallet connection logic in all examples to use near-selector.
• Updated TypeScript types and hooks to match the near-selector API.
• Removed the old wallet folder.