Narrow terminals: fixed-width asset/metric panes squeeze the data pane

[planadecu]

The asset and metric panes have fixed widths, so on narrow terminals the data pane gets what's left. At 24×90 that's 8 columns, and the chart becomes unreadable. In the data pane the parameter bar wraps mid-word ([v]char / t), and the status-bar help text wraps mid-word too (navig / ate).

Proposed fix: let the list panes shrink (min width plus ellipsis) below a breakpoint, or hide the middle pane. Shorten the parameter bar and status bar labels when space is tight.

[planadecu]

More detail from the table-height fix (PR #13). At 24×90 the status-bar help text wraps to 2 lines, but the asset and metric lists are sized as termHeight − 8, which assumes a one-line status bar. So the lists overflow their pane by one row: the last item lands on the bottom border, and Ink squeezes a blank row under the header and into the status bar. The data pane itself is now measured and stays inside its border. Fix together with this issue: measure the lists' available height the same way (measureElement), or keep the status bar to one line.