Review fixes: remove dead code, fix misplaced doc comment
- Remove unused `val_str` variable in `handle_style_set`
- Remove `let _ = bridge;` dead code suppression in `create_class_list`,
prefix param with underscore instead
- Move `collect_roots` doc comment to correct method (was accidentally
attached to `resolve_dom_property`)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>