sidebar: room for the spinner, by default (tab_bar_padding 0 1 0 2)

`│⠋bash: cd` -- the mark landed in the one column of left padding there was,
so it ended up welded to the first letter of the status. The rule was "the
mark takes a column the padding was already holding blank", which is right
about not reflowing and wrong about there being enough of it.

So the mark takes the *first* column of the indent and whatever is left over
is the air after it, and the default indent is two columns instead of one. One
column is still available -- `tab_bar_padding 0 1` -- and now means the
squashed look on purpose rather than by default; three gives two spaces; zero
still puts everything against the frame. Nothing reflows when a program starts
or stops working, which was the point of taking a column that was already
blank.

The labels and the tab numbers move with it, because the indent is the strip's
and not the status's -- a status still starts in the column its tab's name
starts in, which is the rule the leading space existed for in the first place.

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