Fix escaped hyphen regex class translation

[andrewtdiz]

Summary

• preserve escaped hyphen as a literal while translating JavaScript character classes to Rust regex syntax
• add a Node parity fixture covering minimal escaped-hyphen classes and the marked table delimiter pattern

Validation

• cargo fmt --all -- --check
• CARGO_TARGET_DIR=/root/perry-worktrees/perry-node-webcrypto-cryptokey-property-exposure-20260604/target cargo check -q -p perry-runtime --lib
• RUSTFLAGS='-Awarnings' cargo build --release -q -p perry-runtime
• npm exec --yes --package=node@26 -- node --experimental-strip-types test-parity/node-suite/globals/regexp-character-class-escaped-hyphen.ts
• PERRY_NO_AUTO_OPTIMIZE=1 PERRY_ALLOW_UNIMPLEMENTED=1 /root/perry-worktrees/perry-node-webcrypto-cryptokey-property-exposure-20260604/target/debug/perry run test-parity/node-suite/globals/regexp-character-class-escaped-hyphen.ts
• diff -u /tmp/node_regex_escaped_hyphen.out /tmp/perry_regex_escaped_hyphen.out
• git diff --check
• ./scripts/check_file_size.sh

Closes #4425

[andrewtdiz]

Closing this draft as duplicate coverage for #4425. PR #4429 was opened earlier with the same targeted escaped-hyphen translator fix, so keeping the active review surface there.