splash: blasty's transparent logo, and stop guessing the cell aspect

The artwork is now a proper transparent PNG with soft edges (24% of its pixels
carry partial alpha) instead of opaque art on black with a stray full-width
scan line along the bottom. Cropped to its content and resized 1024 -> 768px,
which halves the file and costs nothing visible; logo-trans.png keeps the
master for future re-renders.

Two things the new art exposed, both wrong before it:

fit() assumed cells were 1:2. This terminal reports 9x22, i.e. 1:2.44. The old
logo was 474x516 -- close enough to the assumption that nobody noticed -- but a
square image at the hardcoded 60x33 would have been visibly stretched. The
graphics query now asks for the cell size too (CSI 16 t rides along in the same
round trip, before the DA1 that already synchronises it) and fit() uses the
answer.

The footprint was a constant. logo_cells() derives it from the artwork and the
measured cell size, so the art can be replaced without anyone remembering to
edit a number.

logo.ans was stale: the block-art fallback for terminals that can't draw an
image was still the OLD artwork, scan line included. tools/make_logo_ans.py
regenerates it from logo.png so the two cannot drift again. It understands
alpha -- a transparent cell emits no colour and lets the terminal background
through, and a cell with only one opaque half uses the matching half block so
the pixel lands on the correct side.

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