fix: replace unwrap() with ? in recursive calls

[giwaov]

Summary

Replace .unwrap()\ with ?\ in two locations for proper error propagation.

Changes

• \decorator_storage.rs: Replace .unwrap()\ with ?\ in \�dd_decorator_info_for_node\ recursive call (line 403)
• \debug_var_storage.rs: Replace .unwrap()\ with ?\ in \�dd_debug_var_info_for_node\ recursive call (line 335)

Both functions return \Result<(), DecoratorIndexError>\ and use ?\ throughout for error propagation, but these two recursive calls were the only places using .unwrap()\ instead of propagating errors to the caller.

Closes #2785

[github-actions]

Automated check (CONTRIBUTING.md)

Findings:

• Ensure issue unwrap() instead of ? in recursive calls in decorator_storage and debug_var_storage #2785 is assigned to the PR author.
• Add a short Rationale explaining why the change is needed.

Recommendations:

• Consider adding a Test plan or clear review steps.

Next steps:

• Ensure issue unwrap() instead of ? in recursive calls in decorator_storage and debug_var_storage #2785 is assigned to you.
• See CONTRIBUTING.md for expectations.
• If this is a false positive, comment: /quality-review.