txt section numbering, @typeface :middle/:lift and html scale, NewGardinerOmni, html :leading (from dev 9fa469dd74ed)

Section headings under txt are numbered inside a @document only; @typeface
gains :middle and :lift and its :scale now means the same in html and
pdf; NewGardinerOmni ships (OFL 1.1, Mark-Jan Nederhof) and @egyptian /
@chinese replace @cjk; @table :leading and :colsep reach html; kdesc
--typeface help names the flag; @document.txt is a Python class.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

sks/table/css/table.css

@@ -12,8 +12,13 @@ tr:first-child {
 
 
 td {
-    /* padding-left: 1rem; */
-    padding: .1rem .5rem .2rem .5rem;
+    /* Vertical space is the table's line-height (:leading, set on the
+       <table> by table.py -- the html equivalent of \arraystretch), so no
+       vertical padding here: it was an html-only extra that kept rows
+       looser than the pdf's.  Horizontal padding is :colsep, the same
+       value that becomes \tabcolsep; the fallback is for a table that
+       reaches this rule without the property. */
+    padding: 0 var(--colsep, 4pt);
     vertical-align: top;
 }