Keep `header-cell-text-tracking` for now, but set it to `0` or `unset` in each component as converted to use `-type` tokens directly.
PiperOrigin-RevId: 509882750
In particular, this allows external build tools like Rollup and @web/dev-server to understand imports of Lit, which is configured to require the ".js" extension via its export conditions (so that Lit import maps can remain minimal).
PiperOrigin-RevId: 469772992