katom types from ref/ in groups, @table :leading in lines of text and :rulesep, @code under txt, one table style attribute, literal-klammer options (from dev 2e453744f5e9)

kdesc --katoms is Klammertext rendered from ref/, the types in titled groups,
with --katoms full for the regex column.  @table :leading L is L lines of the
surrounding text in html as in pdf (default 1), and :rulesep spaces the
horizontal rules.  The html table has one style attribute, so :column_width
fractions take effect again.  @code and @source_listing render in plain
text; captions are numbered per kind there, and a table needs no blank line
around it.  @c takes :nd, and an option-shaped word before a bar inside
literal code is code.

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

sks/table/css/table.css

@@ -58,8 +58,21 @@ td {
     --cell-border:  1px black solid;
 }
 
+/* The space between a rule and the text on either side of it: a cell is
+   padded on the side that CARRIES the rule, so a row with no rule is
+   untouched, a partial :hline pads only the cells it crosses, and the
+   table's outer rules are padded on the inner side alone.  The amounts
+   began as booktabs' defaults (0.4ex above a rule, 0.65ex below one) and
+   were tuned by eye, 2026-09-20: half of the space below moved above, so
+   0.725ex above and 0.325ex below, the total unchanged.  The tex target's
+   pair is in table.py (TEX_RULE_ABOVE/_BELOW) and differs on purpose -- a
+   TeX row and an html row distribute their own height differently around
+   the text.  --rulesep is @table's :rulesep, a multiplier, set on the
+   <table> by table.py.  "ex" is the x-height as RENDERED
+   (font-size-adjust), so the space tracks the visible type. */
 .Bt {
     border-top: var(--cell-border);
+    padding-top: calc(var(--rulesep, 1) * 0.325ex);
 }
 
 .Br {
@@ -68,6 +81,7 @@ td {
 
 .Bb {
     border-bottom: var(--cell-border);
+    padding-bottom: calc(var(--rulesep, 1) * 0.725ex);
 }
 
 .Bl {