Splash logo: remove the glow effect, make it much bigger

Removed .ed-splash-glow — its soft radial box read as a visible panel
against the pure-black splash rather than an ambient glow, which is
exactly the "background" the logo appeared to be sitting on. Kept the
one-shot diagonal shine and the blur-to-focus entrance.

Resized the logo image from ~13vw/7vw (roughly wordmark scale) to
72vw/44vw width so it actually dominates the screen — verified at
44.0% of viewport width against a 44vw target.

Note: the uploaded logo file itself has an opaque light-gray rectangle
baked into the PNG (confirmed by opening the raw asset directly, no
styling involved) — not a transparent background. No CSS blend-mode
trick removes this cleanly, since a light-gray fill against a black
page doesn't correspond to a pure-black or pure-white key (screen/
multiply only cleanly hide those). Re-exporting the logo with a
transparent background is the only real fix for that remaining edge.
