sl0p(pane-finder): take the whole viewport on small terminals

The finder always opened as a centred float with a frame. That costs its
margins (16% of columns, 28% of rows), a border, and on this fork the pane gap
as well -- on an 80x24 terminal leaving about 63x14 of the 80x24 available.
Rows are the scarce resource in a list, so most of the results were going to
decoration.

Below 100x30 it now takes the whole viewport and asks to be borderless, which
also drops the gap since this fork skips gap/padding for frameless panes. Above
that the centred float is kept, because it reads better when the space is
there.

The viewport is only knowable from TabInfo, so this re-evaluates on TabUpdate,
which is also how a terminal resize reaches a plugin -- switching modes live in
both directions. Re-applied only when the decision flips, so it does not fight
someone moving or resizing the pane by hand.

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