Extend the packaged-app HUD geometry test from horizontal-only to full
containment: both axes for the dock and the input, plus an explicit
assertion that no percentage translate survives on the composer dock.
The vertical clipping reported on Windows (#82203) and macOS (#82214)
is the same escape class on the other axis, and the computed-translate
probe makes a future optimizer regression fail with a diagnosis instead
of a bare coordinate mismatch.
