Replaces the cool-grey neutral theme with a warm desert dusk palette
pulled from a new pixel-art TopBar: a tiled, right-to-left scrolling
desert under a sky gradient, a 6-frame walking mule sprite where the
logo used to sit, and an ASCII block-character title on a black plate.
The active heap card now uses a cactus/dune scene as its stack
backdrop, and the "Built with hubris" mark moves into the TopBar's
bottom-right corner (AppFooter component removed).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
