feat: implement two-step ownership transfer with pending acceptance a…

[NeduTheDev1]

…nd expiration

Summary

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 📝 Documentation update
• 🔧 Smart contract improvement
• 🧪 Test coverage improvement
• 🏗️ CI/Build improvement

Related Issue

Closes #

Changes Made

Testing

How has this been tested?

• Rust unit tests pass (cargo test)
• SDK compiles (npm run build in sdk/)
• Manual testing against Soroban testnet
• New tests added for changes

Test commands run:

# Contract tests
cargo test

# SDK build
cd sdk && npm run build

Checklist

• My code follows the project's style guidelines
• I have added NatSpec-style comments to new Rust functions
• I have added JSDoc comments to new TypeScript functions
• I have updated the README if needed
• My branch follows the naming convention: feature/<issue-number>-<description>
• I have not modified files outside the scope of this issue

Drips.network Contributor Info

• Drips Profile:
• Issue Claimed: #

Screenshots (if applicable)

Closes #178

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