feat: Major optimizations - Quiz dynamic fonts, TTS 1.2x speed, Video stream copy (10x faster), Single API call, Fact Image dynamic fonts, Text Story position fix

feat: YouTube to HF uploader - folder management, video/audio modes, category naming, text_story UI update

feat: Natural chat AI, TTS speed 1.3x, HF upload to text_story folder

fix: Use GROQ_API instead of GROQ_API_KEY

feat: Add Text Story module with iMessage-style chat video generation