refactor(types): prototype inner-wrapper macro

[darioAnongba]

Summary

• add a small declarative impl_inner_wrapper! macro for tuple wrappers that only need Deref plus From conversions
• refactor the low-risk wrapper types that matched that exact pattern
• keep wasm_bindgen methods and getters explicit so the generated JS and TS surface stays easy to read

Why this slice

Issue #25 is broad, so this PR intentionally takes the smallest safe slice first. It targets the truly repetitive structural boilerplate and leaves field-forwarding methods explicit.

I did not introduce a proc macro here because that would add substantially more maintenance complexity for a small amount of repetition.

Refs #25

Validation

• cargo fmt --check
• cargo clippy --all-features --all-targets -- -D warnings
• cargo test --all-features
• cd tests/node && corepack yarn lint
• cd tests/node && corepack yarn build (blocked in this environment because clang is not installed for the wasm32-unknown-unknown build path)