Add a ▸/▾ toggle button on the right edge of the input row. Tapping
it pops up the full backlog of everything the command line has pushed
since startup — useful once the on-overlay rows have faded out.
The dropdown is a fixed-height scrollable panel rendered above the
input pill. `anchor_bottom` keeps the newest entry in view on open
and `opaque` blocks wheel events from bubbling through to the
viewport shader behind it (without it, scrolling the history zoomed
the drawing). Submitting a command closes the dropdown so the new
prompt is immediately visible.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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