fix: keep an edition's own values in every row of a shared section

[lero62]

A section an edition follows from the library lost content on every read, so an edit made in the
admin came back as the library's own value the moment the document was saved and re-read. The value
written to the database was right; the read put the library's back over it, and the next save made
that permanent.

Two losses, both the same confusion between a template and a row of data:

• The first row of every list, at any depth. shapeOf reads an array's shape off its first row,
  and withShape hands that row back as the shape — correct in the builder, where row one is the
  edit the shape came from. reconcile reused it to fit the library's shape over an edition's
  values, and there row one is an ordinary row: it was replaced by the template wholesale, together
  with everything nested under it.
• Hidden rows. A hidden row carries a hidden field the shape does not have. dressed walked
  the shape, so the marker was dropped and the row came back visible.

withShape keeps its meaning and its caller, the builder's edit path. The fitting half is now
valued + a dressed that treats every row alike: the shape decides which fields exist and how
they are drawn, the value decides what they hold, and the hidden marker is read off the row being
dressed rather than off the one the shape came from. reconcile goes through it, which is also why
reshape is three lines instead of twenty-five.

Two things come along with it: a container swapped for another container in the library
(group ↔ collapsible) no longer empties the editions, since the two hold the same thing; and in
the builder a shape edit now reaches the sibling rows' own settings, which return had used to keep
stale.

Covered by hand against the shape that found this — a collapsible holding an array, and an array
nested inside a row of another array:

• the first row survives a save, at the top level and nested;
• a hidden row stays hidden;
• a field added to the library arrives without touching what is filled in;
• an edition's hidden on the section itself is kept;
• the builder's addAt / editAt still propagate a shape edit to rows two and up, values intact.

check-types is clean and the package is two lint warnings below main.

Editions already overwritten do not come back — the edits were erased by the saves that followed,
and have to be entered again.

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🎉 This PR is included in version 1.3.2 🎉

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