v44.71

5 new wallpapers (same lightweight family as Fluid)

Adds Waves, Drift, Constellation, Mist, Rain — calm, theme-aware 2D-canvas
animations in the same family as the existing Fluid wallpaper. Deliberately NOT
GPU-heavy WebGL shaders, so switching never lags. Pick them in Settings (the
wallpaper picker now shows 6 swatches).

Each: 2D canvas, DPR-capped, paused/speed aware, light/dark theme-aware, full
cleanup on unmount. An adversarial perf/leak/correctness review ran and all
findings were fixed (drift bounding-box fill, paused-resize repaint, mist dt clamp).

Builds on v44.70.

Full Changelog: v44.70...v44.71