Follow-up UX polish surfaced during the full browser verification of the docked AI chat (ADR-0057, epic #2409 — #2467 / #2469 / #2470 / #2475). The dock is now the console's one chat presentation; these items refine it. Prioritized by day-to-day impact. ## High impact ### 1. Mobile chat is "chat-only" — no history / share / Live Canvas from the sheet After the mobile bottom sheet dropped its maximize button (#2475, it navigated away from an open Radix sheet and left the page blank), the sheet is the only mobile entry — and it has no path to the conversation-history list, share, Build Doctor, or the **Live Canvas** (ADR-0037 needs horizontal width a sheet can't give). So a mobile `build` session that drafts an app can't see the live preview. - Direction: a *clean* path to full-page `/ai` from the sheet (fully close the sheet, then navigate next tick — avoiding the teardown residue #2475 fixed), or a mobile history drawer + full-screen canvas toggle. Needs a small mobile IA design; own PR. ### 2. Studio right dock re-expands on every visit (collapse not persisted) `StudioChatDock` uses `defaultExpanded: true` with in-memory state (no persist key), so a user who collapses it sees it re-open on every pillar switch / package change / re-entry, imposing ~420px on anyone who wants the classic three-zone canvas. - Direction: persist the collapsed preference (localStorage), scoped so it doesn't fight the console dock's own state. ### 3. Studio folded layout hides the canvas while editing properties (< 2xl) On non-`2xl` viewports, selecting a block auto-switches the center to the Properties tab, so the canvas (the WYSIWYG feedback) disappears while you edit. The 2xl side-by-side only helps very wide screens; `xl` (~1280–1536, the common laptop) still tabs. - Direction: lower the side-by-side breakpoint to `xl`, and/or keep a live mini-preview in the Properties tab. ## Medium ### 4. Canvas auto-maximize is an abrupt width jump Opening the Live Canvas snaps the rail to max width with no transition. Add a CSS width transition. ### 5. Discoverability of the "one thread, many views" model Maximize (⤢) / collapse-to-dock (⇥) are icon-only; that `/ai` and the rail are the SAME conversation isn't obvious, and ⌘⇧I is unshown. A first-run hint / better tooltips would help. ### 6. Console ↔ Studio share the chat width The width localStorage key is shared on purpose; a wide console chat then squeezes the Studio canvas. Reconsider per-surface width, or document it. ## Low / polish - 7. Empty-state suggestion chips wrap awkwardly inside the ~420px rail. - 8. Mobile sheet empty state has a lot of whitespace at 85svh. --- Planned order: **#2 + #3** first (small, in already-touched files, fast to verify) as one PR; **#1** as its own PR (mobile IA). Refs ADR-0057.