Fix ethers.js v6 API compatibility and dependency management

[Copilot]

Recent feature commit introduced ethers.js v6 packages but used deprecated v5 API syntax across 8 files, plus misplaced dependencies in package.json files.

Changes

Ethers.js v6 API Migration

• Provider initialization: ethers.providers.JsonRpcProvider → ethers.JsonRpcProvider, Web3Provider → BrowserProvider
• Utility functions: ethers.utils.* → ethers.* (parseEther, formatEther, parseUnits, formatUnits)
• Constants: ethers.constants.MaxUint256 → ethers.MaxUint256
• BigNumber methods: .lt(), .mul(), .div() → native BigInt comparisons
• Contract deployment: deployed() → waitForDeployment(), .address → await getAddress()
• Transaction history: Replaced deprecated getHistory() with block-based queries

Dependency Fixes

• Created backend/package.json with ethers ^6.10.0, axios, dotenv
• Moved react-native-onesignal from smart-contract to mobile-app where it's used
• Removed conflicting dependencies from root package.json (next, react-native, web3 v1, hardhat)

Example Migration

// Before (v5)
const provider = new ethers.providers.JsonRpcProvider(url);
const amount = ethers.utils.parseEther("1.0");
if (allowance.lt(amount)) { ... }

// After (v6)
const provider = new ethers.JsonRpcProvider(url);
const amount = ethers.parseEther("1.0");
if (allowance < amount) { ... }

Performance Improvements

• Added cache size limit (1000) to prevent memory leaks in transaction monitoring
• Optimized block fetching to request transaction hashes only, not full details upfront

Files Modified: 8 JS/TS files for API migration, 4 package.json files for dependencies

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• binaries.soliditylang.org
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/Aetheron_platform/Aetheron_platform/smart-contract/node_modules/.bin/hardhat compile (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Review and fix all errors introduced, revealed, or left unresolved in commit 64fd8ad. Ensure code correctness, proper dependency usage, and resolve any exceptions or warnings appearing due to this commit. Validate consistency with prior logic and intended feature changes.

This pull request was created from Copilot chat.

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