fix(lua): extract assigned function expressions

[danusha2345]

Summary

Fixes #1616.

• index function expressions assigned to locals, table members, static keyed fields, and nested callback tables
• attribute calls inside those expressions to the callable node instead of the file node
• keep dynamic bracket keys unguessed and avoid extra variable nodes for ordinary member assignments
• implement the same behavior in the TypeScript/WASM and native Rust extraction paths
• bump the extraction version and add extraction, resolution, callers, and kernel-parity regressions

Verification

• npm run build:kernel
• npm run build
• focused extraction/resolution/native parity suite — 820 passed
• npm test -- --reporter=dot — 194 files, 3231 passed, 10 skipped