Add copy-response button and harden Ask Jerry chat streaming.

fix: render options menu via portal to body (escapes overflow clip)

fix: options menu fixed position + measured top so it escapes overflow clip

copy: drop (text-to-speech) from Always speak hint

ui: split Always speak vs Playback speed in Settings; trim hints

ui: group Settings into boxed sections, move persona to bottom

fix: show TTS speed control button on all messages, not just during playback

feat: TTS playback speed control (1x / 1.5x / 2x) in message controls and Settings

feat: add skip-back button for TTS playback (replay current or previous sentence)

refactor: simplify TTS pipeline with stable sentence boundaries, remove prefetch cache

feat: STT/TTS (Coqui/Whisper), always-speak, mic input, TTS prefetch

ui: wide-layout chat columns, label alignment, remove AI dot

ui: compact sticky footer, custom tooltips, button hover polish, favicon

feat: markdown rendering, jump-to-latest-question, web search button

feat: share menu, export as Markdown or plain text, chat UI updates

UI: align header with reference layout; icon-only toolbar with titles

Add context window handling, summarize endpoint, and UI polish

Initial Ask Jerry demo: React UI on 3006, FastAPI proxy to vLLM on 8006