Replace the static success illustration with HashBagSuccessAnimation: the money
sack sits at the bottom and #/$/₿ glyphs erupt from its mouth, rising and fading
on a loop. Glyphs are PNG assets (the app bundles no font with a ₿ glyph).
InfoPage gains an overridable buildIllustration() hook (default unchanged:
static HashImageWidget); only TransactionSuccessPage overrides it, so every
other InfoPage is untouched.
NOTE: written without a local Flutter build (Dart pub can't resolve here) —
verify on the next CI/device build. Self-contained and revertible; the static
hash_bag.png remains the fallback via imageLightPath/imageDarkPath.
jwinterm
2e33f8324e