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deepseek-harness/packages/client/ui-sidebar/README.md
07akioni aeb8b1f486 feat: implement new session behavior to clear selection and show empty state
- Added bilingual notes for the new session feature, detailing the transition to an empty state upon session creation.
- Updated `SessionsService` to include a `clear()` method that resets the current selection and persists the empty state.
- Enhanced the `EmptyState` component to reflect the new design, including workspace selection and input handling.
- Modified CSS styles for improved layout and visual consistency in the empty state.
- Updated tests to cover the new session clearing functionality and its effects on the UI.
2026-07-24 14:09:00 +08:00

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# @deepseek-ai/dsh-client-ui-sidebar
Sidebar plugin: session multi-level tree (cwd grouping + parentId nesting), search, by-workspace grouping, state dots, three creation entries. Top-level New Session / New Workspace clear the selection onto `conversation.empty`; per-project "+" still create-then-opens. Collapse is a slide + crossfade into the layout-owned 56px rail (open / new session / new workspace / search — search expands and focuses the search box — plus the settings foot): the expanded content freezes at its width and fades in place while the column slides over it, then the rail — whale mark resting, panel icon on hover, tooltips on every control — crossfades in at settle as the wide content unmounts. Contract: the [slot system standard](../../../.agents/notes/implemented/architecture/2026-07-22-slot-type-chain-implementation.md).
`src/client/contract/slots.ts` is the single-domain contract file: `SidebarRootInjected` (the registrant's own injected share — plain service callbacks: onOpen/onCreate/onToggleSidebar) and `SidebarRootComponentProps = PropsRuntime<'sidebar'> & SidebarRootInjected` (owner `{collapsed,width}` plus the standard `useSessions` hook, resolved off ui-layout's SlotMap declaration, never re-stated). `apply` registers SidebarRoot cast-free against that composition; the inject factory closes over the plugin's own ctx.
There is no plugin store: rows derive in the component (`useMemo` over the `useSessions` snapshot + local expansion/search state) through the pure `deriveRows` in `tree.ts`.
The `/client` export surface is the plugin body (`apply`/`inject`) plus the contract types only — SidebarRoot, the row components, and the tree derivation are internal (the slot registration closes over them; tests import src paths directly).
## Model Experience
None, as the sidebar renders the browser session list; nothing here reaches a model request.
#### KV Cache effect
None; this package neither assembles nor sends a provider request.
## Known Limitations and Deferred Work
- **State dots have two live data states (running/none)** — the done/error/amber sources arrive with P-II approvals and notifications; the four-color primitive is already wired.
- **Group-by menu ships by-workspace only** — Update/Status grouping strategies are drawn without specs and deferred.
- **"New task completed" unread marking is local viewing state** — completion-time > last-seen never reaches the host.