feat(keybinds): draw the macropad beside the list

The pad glyph on each row was too small to read. The left fifth of the
overlay now draws the pad at size, each key labelled with its plain
action; hovering a key or an encoder lists everything it does, held
keys and turn direction spelled out. padActions() in Binds.js inverts
the grouped rows into that per-key list, and PAD's turn values became
words for it. The panel is pinned at a fixed height: centred, it moved
whenever the hovered key's list changed length.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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