improvement: avoid full width for column faceted charts

[mscolnick]

Fixes #6865

Column faceted charts don't play nicely with width="container", so we should skip adding that as default.

Can be tested with:

import altair as alt
from vega_datasets import data

source = data.barley()
chart = (
    alt.Chart(source)
    .mark_bar()
    .encode(
        x="year:O",
        y="sum(yield):Q",
        color="year:N",
        column="site:N",
    )
)
chart

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Project	Deployment	Preview	Comments	Updated (UTC)
marimo-docs	Ready	Preview	Comment	Oct 22, 2025 7:02pm