Chat composer overhaul (draft autosave, @ mentions, image attachments, slash-command palette, live list continuation), sidebar rework (favorites, active/parallel chats, quick chat, chat-level archive), and new chat message viewers (charts, Mermaid diagrams, recipe/map/kanban/weather cards). Auto-update is live for the first time — the update server at open-atelier.app/update now serves real signed artifacts.
Fixes: credential resolution (profile-scoped keys), stuck streams, auto-titling on first-message error, icon padding, and the updater endpoint (was missing the CPU architecture in its URL, so update checks always failed).
Platform availability in this release: macOS (Apple Silicon) only — built and signed locally. Linux and Intel Mac builds are pending; the CI pipeline that builds them is temporarily blocked on this account's GitHub Actions billing and will follow once resolved.