The drag preview was a 1 px axis-aligned rectangle for every shape tool,
which read as no preview at all against most comps. Draw the tool's own
path instead (rectangle, rounded rectangle, ellipse, polygon, star), from
the engine's own geometry, filled with the Tools bar's Fill and outlined
in its Stroke, with a caption saying where the shape lands — a mask on
the selected layer, into the selected shape layer, or a new shape layer.
The ghost and the released shape go through one normalisation, so the
drag shows exactly what it commits: Alt (Option) draws from the press
point and Shift squares the box, both live. The drag also starts at the
press point now, not where the 6 px drag threshold was crossed, so the
shape is drawn from where the button went down, as in After Effects.
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