Fix easter egg button visibility — scoped CSS, larger emoji, removed broken fixed position

Easter egg: bigger button, microscope emoji, more visible at rest

Fix easter egg button positioning — fixed top-right, slightly more visible on hover

Update to four_class best model: tau=0.15, expanded project overview

Upload app.py with huggingface_hub

Pull existing log from HF on startup to prevent overwrites on restart

Log predictions to HF dataset repo via CommitScheduler

Deploy algospeak classifier — model loaded from HF Hub at runtime