Wallet & Chain Core Fully Implemented

A major development milestone has been achieved: NanoChain's browser-native wallet functionality and the core chain logic (including blocks, signatures, and chain structure) are now fully implemented. This signifies that the foundational elements for a fully functional NanoChain are in place.

This critical progress allows for independent transaction signing, block creation, and local chain validation, all within the browser environment. It underpins the entire NanoChain ecosystem, demonstrating the viability of its lightweight, client-centric architecture.