Fix page header: SPARK acronym expansion (was leftover TRACE)

Rebrand TRACE -> SPARK

Phase-2 joint image+waveform models + From-Image hybrid pipeline

From-Image: gallery shows the input plots (not pre-rendered outputs); add note that digitized curves often trigger OOD

Add OOD detection (CV+TPD), 9 CV / 11 TPD ID demos + 4 CV / 2 TPD OOD demos, scan-rate doc

Posteriors: legend for mean/median markers; footer: drop Built at MIT

Rename: Amortized Chemistry Estimation -> Amortized Conditional Estimation

Header subtitle: expand TRACE and TPD acronyms

UI polish: card layout, per-mechanism detail tabs, mode radio

Initial TRACE deployment: rebrand from ECFlow + noise-aug headline checkpoints