reading: clear stale reading on entry; faster first-card paint (back last + brisk poll)

Sync from dev: Qwen3-14B (single model) + FLUX.2-klein, generative scribe, 4-way parallel scribe/paint, lazy deck view, prompt logging, GUI + card-frame fixes

promote ZeroGPU local-first build: Nemotron via llama.cpp + FLUX.2 via diffusers

Coverflow deck view (swipe/flip/fade carousel + overhead toggle + in-page lightbox), zip download, arcana subtitle