Fix expected string or bytes-like object TypeError in format_thinking_tags by ensuring text is returned and type-checked

Import missing re module in src/engine.py

Handle gated repository errors gracefully and support hf_token for local loading

Fix UI compilation issues, rename app to Saffan Chat, add AI Persona & Skill presets

Implement thread-free KV-cached inference to prevent Zero-GPU thread hang and quota drain

Deploy premium Claude-style LLM chatbot with web search, scraping, memory, and access control