The ansi target, txt table styles, kdesc reference from ref/, typeface and table-width fixes (from dev fcec5e2e77ac)

Since the previous release: Machine::read_string() (the fs::path/std::string
overload pair split); kdesc -c and -u rendered from the ref/ reflection
klammerset; a fit column's tex width measured in TeX over every entry;
@typeface resolving to the family its css declares (a store directory name
now works in html) and hieroglyphs in @unicode_examples set in their
typeface; the ansi target -- plain text with the type styles a terminal can
show, identical to txt once the escape sequences are stripped -- with the
txt @table carrying :header_style, :style and :hline; @block anchoring,
@table spacing and the Image_quality state variable; and the rewritten
doc/klammertext_for_llm.md.

sks/target/txt_util.py

@@ -44,7 +44,7 @@ def visible_length(s):
     escape sequences as visible width, and the reason escape resolution
     runs BEFORE the txt phases.)
     """
-    return len(klammer_base.unescape_ktesc(s).replace(NBSP, " "))
+    return phases.txt_visible_length(s)
 
 def indent_text(text, indent):
     """Every line of text prefixed with `indent` columns of NBSP."""