feat: P0/P1 — Image, OCR, Translation tabs + styled headers on all tabs

feat: UI theme + voice fix + ENV.md + improvements roadmap

feat: wire STT/TTS/Nemotron/Federation/Florence2 — surface hidden services

feat: P5/P6 model swap + modal fix + doc consolidation

fix: llm.chat IndexError (lazy Ollama warm + safe _resolve_backend fallback) + chat self-send returns direct

Add all-to-all internet mesh over relay hub (P1-P3) + user-story screenshot proof