Reproducción inline de canciones y cuentos, mic como botón de terminar

Add real song playback, precache stories, improve LLM fallback

Add panel parental, fix app.py docstring, model card, and open trace

Add Sofia color-change, Cuentos frontend section, Ollama local backend

Rework frontend UI, add Actividades and Canciones sections

Simplify startup flow: drop scripted greeting, start from child's first turn

Fix ZeroGPU import order: spaces before torch

Pivot LLM runtime: llama.cpp (CPU) -> transformers + ZeroGPU

Fix LLM perf on free CPU tier: pin n_threads=2, warmup at startup

Rename persona Lumi -> Sofía, prep for HF Space deploy

Initial commit: Lumi pipeline migrated to llama.cpp, local-first TTS