slosh: minimized panes wear buttons in the strip

A row of dim bare names read as a caption, and nobody clicks a caption.
Each entry now wears square brackets -- [▬ name] -- because that is what
clickable already looks like in this program: [re-run], [close], the
buttons a pane's own row offers. The put-away mark rides inside each entry
instead of standing at the head of the row as a legend: a legend explains
the row once, a mark per entry says what each button is. A rung pane's
bell mark keeps its own colour inside the brackets, and the whole bracket
is the hit, as one geometry demands.

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