Complete ethers.js v6 migration and fix dependency organization

[Copilot]

PR #12 partially migrated to ethers.js v6 but left v5 API calls throughout the codebase and misplaced dependencies across package.json files. This completes the migration and reorganizes dependencies properly.

API Migration

All ethers.js v5 → v6 API changes across 13 files:

• Providers: ethers.providers.Web3Provider → ethers.BrowserProvider, ethers.providers.JsonRpcProvider → ethers.JsonRpcProvider
• Utilities: ethers.utils.* → ethers.* (parseEther, formatEther, parseUnits, formatUnits)
• Constants: ethers.constants.MaxUint256 → ethers.MaxUint256
• BigNumber → BigInt: .lt(x) → < x, .mul(95).div(100) → (x * 95n) / 100n
• Contract deployment: deployed() → waitForDeployment(), .address → await getAddress()
• Transaction history: Replaced deprecated getHistory() with block-based queries

Example migration:

// Before (v5)
const provider = new ethers.providers.Web3Provider(window.ethereum);
const signer = provider.getSigner();
const amount = ethers.utils.parseEther("1.0");
if (allowance.lt(amount)) {
  await token.approve(spender, ethers.constants.MaxUint256);
}

// After (v6)
const provider = new ethers.BrowserProvider(window.ethereum);
const signer = await provider.getSigner(); // now async
const amount = ethers.parseEther("1.0");
if (allowance < amount) { // native BigInt comparison
  await token.approve(spender, ethers.MaxUint256);
}

Dependency Reorganization

• Created backend/package.json with ethers v6, axios, dotenv
• Moved react-native-onesignal from smart-contract → mobile-app (where it's actually used)
• Cleaned root package.json: removed next, react-native, web3 v1, hardhat (belong in subprojects)
• Updated HTML files to ethers v6 CDN

Implementation Fixes

Transaction monitoring (backend/push-notify-wallets.js):

• Replaced deprecated getHistory() with block iteration
• Changed Set → Map for LRU cache eviction (prevents duplicate notifications)
• Correctly handles v6 transaction hash structure

HTML dashboards:

• Updated CDN links to ethers-6.10.umd.min.js
• Fixed async getSigner() calls

Documentation

• ETHERS_V6_MIGRATION.md: Migration reference with before/after examples
• Firewall workaround: Documents binaries.soliditylang.org DNS block issue with 4 solution options (GitHub Actions pre-setup, allowlist config, local cache, exact version pinning)

Security

CodeQL: 0 alerts

Original prompt

Comprehensively fix all unresolved errors in the pull request 'Fix ethers.js v6 API compatibility and dependency management' (PR #12):

• Fully resolve and validate the migration from ethers.js v5 to v6 across all code, making sure no v5 syntax or utility remains (e.g., providers, constants, utils, BigNumber method calls).
• Correct any remaining compatibility issues from the API migration, especially BigNumber to BigInt logic.
• Ensure all dependencies are properly placed in the correct package.json files (backend, mobile-app, smart-contract) and there are no conflicting or stray dependencies in the root package.json.
• Fix or clearly report any errors that occur during build, lint, or test stages after these changes, including issues in smart-contract tools (e.g., hardhat) or CI workflow steps.
• Address firewall/DNS-block issues (e.g., with 'binaries.soliditylang.org') by adding recommended pre-setup steps or documentation in the repo to allow successful dependency fetching/build in CI pipelines.
• After code and config corrections, verify all repository workflows pass and no errors or warnings appear in CI and local test runs.

Summarize changes in the pull request description as needed, including any additional steps future contributors must take for successful migration or build, especially regarding network/firewall prerequisites.

This pull request was created from Copilot chat.

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