chore(deps): periodic dependency audit and upgrades

[darioAnongba]

Summary

Periodic audit of all dependencies for security updates and version bumps.

Key Dependencies to Track

• wasm-bindgen (currently 0.2.100)
• bitcoin (currently 0.32.6)
• serde / serde-wasm-bindgen
• web-sys
• bdk_wallet / bdk_esplora (tracked separately)
• Dev: wasm-bindgen-test
• Node tests: jest, typescript, eslint

Tasks

• Run cargo audit (or equivalent) to check for known vulnerabilities
• Check crates.io for newer compatible versions
• Check npm dependencies in tests/node for updates
• Update and verify CI passes