Fix columns for columns of multiple batch-length==1 fixed size arrays

[Wumpf]

Related

• Follow-up to Infer partition size for FixedSizeList-backed components #9210

What

In other words, the following snippet broke (which got caught by now-red main ci! phew!)

rr.send_columns(
    "box",
    indexes=[rr.IndexColumn("tick", sequence=range(1, 101))],
    columns=rr.Transform3D.columns(
        translation=[[0, 0, t / 10.0] for t in range(100)],
        rotation_axis_angle=[
            rr.RotationAxisAngle(axis=[0.0, 1.0, 0.0], radians=truncated_radians(t * 4)) for t in range(100)
        ],
    ),
)

rotation_axis_angle worked fine, but translation broke because the columns call incorrectly assumed that it's 100 columns (correct) each with a batch size of 3 elements (very wrong).

• pass full-ci

[github-actions]

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Result	Commit	Link	Manifest
✅	5686c9e	https://rerun.io/viewer/pr/9262	+nightly +main

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[Wumpf]

@rerun-bot full-check

[github-actions]

Started a full build: https://github.com/rerun-io/rerun/actions/runs/13793625415

[Wumpf]

@rerun-bot full-check

[github-actions]

Started a full build: https://github.com/rerun-io/rerun/actions/runs/13795028977