docs(web): record workspace sidebar behavior

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_Kerman
2026-08-11 15:24:56 +08:00
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English | [中文](README.zh.md)
Sidebar plugin: real Host Workspaces in stable Host order, each containing its `sessionIds` in Workspace order with `parentId` nesting; Sessions outside every Workspace appear in a trailing `Ungrouped` section. Search, state dots, and collapse into the layout-owned 56px rail are presentation-local. Contract: the [slot system standard](../../../.agents/notes/implemented/architecture/2026-07-22-slot-type-chain-implementation.md).
Sidebar shell plugin: the wordmark, New Session action, layout-owned collapse control, scroll-aware region seat, and bottom-pinned Settings seat. [ui-workspace](../ui-workspace/README.md) owns the Workspace and Session browser rendered into `sidebar.workspaces`; this package neither derives its rows nor owns its view preferences. Collapse into the layout-owned 56px rail remains presentation-local. Contract: the [slot system standard](../../../.agents/notes/implemented/architecture/2026-07-22-slot-type-chain-implementation.md).
New Session starts the runtime's page-local frontend Session Intent; a real Workspace's "+" starts one targeted to that Workspace. The Workspace header "+" opens ui-workspace's shared picker, whose selection also targets a frontend Session. A Workspace Intent does not appear in the sidebar.
New Session starts the runtime's page-local frontend Session Intent. The runtime targets the explicit Workspace used by a scoped action, otherwise the current Session's Workspace, otherwise the most recently active Workspace; when none exists it clears into the blank New Session page. Workspace-specific controls and the shared picker belong to ui-workspace.
`SidebarRootComponentProps` composes the layout owner share, the global `useSessions` and `useWorkspaces` hooks, the declared `sidebar.workspace` and `sidebar.settings` child slots, and injected `startSession`, `open`, and sidebar-toggle callbacks. There is no plugin store: `deriveGroups` consumes object-layer snapshots and component-local expansion/search state.
`SidebarRootComponentProps` composes the layout owner share, the global `useSessions` and `useWorkspaces` hooks, the declared `sidebar.workspaces` and `sidebar.settings` child slots, and injected `startSession` plus sidebar-toggle callbacks. There is no plugin store.
Scrollbars in the column are a pointer affordance: the shell rebinds ui-theme's [scrollbar indirection](../ui-theme/README.md) to `transparent` whenever the pointer is outside it, and keeps the thumb drawn for 2s after the pointer leaves, so a list nobody is pointing at carries no bar. The reservation that keeps rows from moving belongs to the scrolling region ([ui-workspace](../ui-workspace/README.md)), so revealing a thumb never reflows.
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## Known Limitations and Deferred Work
- **Session state-dot rendering is owned by [ui-workspace](../ui-workspace/README.md)** — no done/error notification sources are available.
- **Group-by supports Workspace only** — Update and Status are not available strategies.
- **Workspace browser behavior is composition-owned** — grouping, ordering, search, and row state belong to [ui-workspace](../ui-workspace/README.md), not this shell.
- **"New task completed" unread marking is local viewing state** — completion-time > last-seen never reaches the host.