feat(wave4): 8 features — slash cmds, search, qr-share, /help, image gen, code sandbox, debate, cost tracker

feat: doc editor + offline mode + stats trio + i18n framework

feat(cloud-sync): GitHub OAuth + Upstash Redis cross-device sync (LWW)

fix(typewriter): skip animation for already-loaded history messages

feat(phase1-wave5): SSE streaming + share-link + BYOK + analytics + branching + a11y + nav-bar fix

feat(phase1-wave4): voice + tool-toggle + prompt-library + error-log + fix webSearch DDG

feat(phase1-wave3): pin/tags/FTS + file upload + personas + memory

feat(phase1-wave2): export chat + token counter + shortcuts + PWA + adaptive typewriter

feat(history): full CRUD (rename inline, duplicate, delete confirm), persist mid-stream

feat(ui): hamburger menu with chat history sidebar

feat(chat): ChatGPT-like actions (regenerate/edit/New chat) + fix typewriter

feat(stream): client-side typewriter + Groq default + visible error UI