_as_table() only detects tables whose data rows are indented deeper
than a ":"-terminated label. The "Component Reference" tables use a
different convention (header, dashed rule, rows all at the same
indent), so they never matched and fell through to a plain indented
code block on the Starlight site.
Add _as_ruled_table() to recognize that header+rule+rows shape. It
supports N columns, folds word-wrapped continuation lines into the
previous row, and backtick-escapes cells containing "<" or "{" instead
of rejecting the table outright (unlike _as_table's stricter guard,
which those tables would otherwise trip on for angle-bracket
placeholders and brace globs).
Also fixes four ambiguous rows in 07-customization.md where two
columns had collapsed to a single space, making them indistinguishable
from a word-wrapped continuation.
rootiest
