Fix typing

[claudio525]

No description provided.

[claudio525]

@claude review

[claude]

Claude Code is working…

I'll analyze this and get back to you.

View job run

[claudio525]

@claude review

[claude]

Claude Code is working…

I'll analyze this and get back to you.

View job run

[claudio525]

@claude review

[claude]

Claude finished @claudio525's task in 48s —— View job

---

Review complete ✅

• Gather context (diff, CLAUDE.md, prior review comments)
• Review changed files for correctness bugs
• Post findings

Findings: 0 (no correctness bugs found)

The change is a small, self-consistent typing fix:

• qcore/coordinates.py: distance_between_wgs_depth_coordinates now wraps the scalar branch's np.linalg.norm(...) result in float(...) and updates the return annotation to float | np.ndarray, matching the actual runtime type returned for single-point inputs (repo requires Python ≥3.11, so the X | Y union syntax is fine).
• tests/test_grid.py / tests/test_coordinates.py: assertions updated to match (isinstance(..., float) instead of np.floating, and a now-unneeded # ty: ignore[unsupported-operator] comment removed).

The branch logic (multi-point vs single-point) and docstring are unchanged and remain accurate. No repo CLAUDE.md/REVIEW.md found to check against. No prior review comments to reconcile with.