Fix #489: use public supervision API for annotation (works on 0.18-0.29)

[prawnsgupta]

Fixes #489.

Problem. tabs/dataset_viewer.py imported BoxAnnotator from the internal path supervision.detection.annotate, which was removed in supervision ≥ 0.22, causing ModuleNotFoundError for anyone whose environment resolves a supervision newer than the pinned 0.18.0. While investigating I also found that the shared utils/image.py::draw_detections() helper (used by tabs/inference.py) crashes on modern supervision because its palette fallback calls sv.Color.DEFAULT / sv.ColorPalette.default(), both of which raise AttributeError on recent versions (and are not caught by its except TypeError).

Fix.

• utils/image.py: use sv.ColorPalette.DEFAULT (available on old and new supervision) and keep the existing old-API/new-API try/except, so both BoxAnnotator-combined (≤0.21) and BoxAnnotator + LabelAnnotator (≥0.22) paths work.
• tabs/dataset_viewer.py: remove the broken inline annotation and delegate to draw_detections(), matching how tabs/inference.py already renders detections.

Verification. Tested end-to-end against supervision 0.18.0 (current pin) and 0.29.1 (latest); both render boxes/labels and return a valid uint8 ndarray. No dependency changes required — confirmed numpy 1.26.4 (project pin) coexists with modern supervision.