chore: upgrade dependencies, improve test config, and update TypeScript setup

[fahmidareem3]

Summary

This PR focuses on dependency upgrades, test configuration improvements, and TypeScript setup updates across the monorepo to ensure better stability, compatibility, and developer experience.

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Changes

🔧 Dependency Updates

• Upgraded core dependencies:
  • typescript → 6.0.3
  • jest → 30.3.0
  • ts-jest → 29.4.9
  • @types/node → 25.5.2
  • viem → 2.47.6
  • @changesets/cli → 2.30.0

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🧪 Testing Improvements

• Updated Jest configuration:
  • Added explicit testMatch
  • Increased testTimeout
• Separated test scripts:
  • test:unit
  • test:integration
• Added dedicated tsconfig.test.json for test environment

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⚙️ TypeScript Configuration

• Upgraded to TypeScript 6 support:
  • Added "ignoreDeprecations": "6.0"
• Improved compiler settings:
  • Updated target, module, and moduleResolution
  • Enabled:
    • experimentalDecorators
    • emitDecoratorMetadata
• Enhanced type support for Jest and Node

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📦 Package Adjustments

• Refined scripts for better test targeting
• Improved build and type consistency across:
  • contracts
  • payments

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Impact

• ✅ Better compatibility with latest TypeScript ecosystem
• ✅ More reliable and structured testing setup
• ✅ Improved developer experience and maintainability
• ⚠️ Minor breaking changes may occur due to TypeScript 6 upgrade (handled via config)

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Notes

• No functional logic changes introduced
• Primarily focused on tooling, testing, and DX improvements

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