Replace hand-coded cabinet/lever/icons with real generated art

The user generated actual 3D-rendered assets (cabinet frame, lever,
reel-symbol sprite sheet) via an image model - swaps out the
StyleBoxFlat-approximated cabinet, Tween-animated marquee lights/glow,
and gradient-SVG icons from the last pass for the real thing.

The generated PNGs had no real alpha channel (a baked checkerboard
pattern standing in for transparency, a known limitation of some
image-gen output) - added a flood-fill background remover (BFS from
the image border, matching near-white/grey checkerboard tones) to
produce genuinely transparent PNGs, then sliced the sprite sheet into
6 individual icons and measured the cabinet's empty reel-window
rect as a fraction of the frame image so the real 3x3 reel grid and
lever can be positioned precisely over the static art via anchors.

Verified with actual rendered screenshots at each step (window
alignment, then lever sizing/position) rather than just structural
checks, since this is exactly the kind of thing that looks fine in
code and wrong on screen.

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