Table: pass calc() cell widths through to Taffy for column sizing

[nicoburns]

Summary

Fixes CRASHes in css/css-values/calc-width-table-auto-1.html and css/css-values/calc-width-table-fixed-1.html (css/css-values: 6 → 4 crashes; the remaining 4 are unrelated).

The match over taffy::CompactLength tags in collect_table_cells column sizing (table.rs:301) hit unreachable!() for calc() cell widths. Since taffy::Dimension can only be length, percent, auto or calc, the remaining case is calc; the fix passes the Dimension through as the column track sizing function (_ => style.size.width.into()), so Taffy resolves the calc expression against the table's inner width during track sizing — the appropriate basis, which isn't known at column-collection time.

Link to Devin session: https://dioxus.staging.devinenterprise.com/sessions/a8bd4846bf354f33a6037fffaca1f583
Requested by: @nicoburns

WPT results

1 newly passing, 0 newly failing (net +1), 1 other status change.

Full diff (2 changed tests)

+ Crash => Pass css/css-values/calc-width-table-auto-1.html
! Crash => Fail css/css-values/calc-width-table-fixed-1.html

_{Generated by the WPT workflow.}

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