Layout: golden screens, e2e flows and polish

A trip plan laid out through the Format menu (a merged title, borders
with a double line under the headers and a thick outline, wrapped notes,
a taller row) in dark and light and on a 60-column terminal with the
pointer on the merged title; the question before a merge clears values;
the Borders menu; a row's height being dragged. e2e tests draw the table,
save and reopen it, click into the merge and drag a row's height.

Lines stay in the border's role through the pointer and selection, so a
table's lines run on through them; a merged active cell highlights the
headers of all its columns and rows; the merge question is short enough
for the context line, with the cell it clears on the status line; the
entry replaces a merged cell's value while it's typed; the context line
says a row's height while its corner is dragged. The .012 version stays
2 with the new fields.

commit

6aee51a6ba212de259566555a14bb7d88ea6bf0d

parent

e39d5d9f1b2ef59238bc21bb8da2dcfc5a51cdf0

author

Dami <dami.etoile@gmail.com>