sidebar: the new-tab button says what it is, given a row to say it on

The mark went bare because in the strip it sits at the end of a row of
tabs, where the company it keeps says what it does and columns are
scarce. A sidebar row is neither: it is a row of its own with columns
to spare, and a lone glyph on it reads as decoration -- the hint under
the pointer cannot help, since you have to suspect a thing is a button
before you hover it.

So with the room it reads '+ new tab', in the word hint_for already
gives this action rather than a second name for the same thing, and
falls back to the bare mark when the sidebar is too narrow. The strip
is untouched. The row fills and hits like a tab's, so hover and the
drop-target fill cover the row rather than the word on it.

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