fix: strip non-spatial axes before passing array to MedVol

MedVol expects a spatial-only array, but MLArray files may have a channel
or component axis (e.g. shape (1, 344, 512, 512) with axis_labels
[channel, spatial_z, spatial_y, spatial_x]). Passing a 4-D array caused
MedVol to misinterpret the geometry or error out.

The fix takes index 0 along each non-spatial axis (identified from
meta.spatial.axis_labels) before constructing MedVol. ndim for the
scale/translate loop is derived from the actual display array shape
rather than mlarray.ndim to avoid phantom scale entries.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

feat: Added 3D bbox support

Adds a napari reader plugin for .mla files, enabling the loading of
image and labels data, as well as bounding box annotations.

The reader utilizes `napari-bbox-fix` to correctly display bounding boxes
with dimension 3 or higher, leveraging it's custom layer type. For 2D
bounding boxes, it converts them to napari shapes.

Fixes an issue where bounding boxes were not correctly displayed in napari.

feat: Added bbox handling

doc: Updated project description