feat: slot system + entries/priority/errorreport + typert generator

packages/client/ui-sidebar/src/client/SidebarRoot.module.css

@@ -227,11 +227,39 @@
   padding-left: 0;
 }
 
-/* Foot seat: a pure layout socket pinned under the region; the ui-settings
-   trigger row inside owns its own geometry (38px wide row / 36px rail
-   circle) and hover chrome. */
+/* Footer seats: Settings fills the left side and additive actions sit on the
+   right. Each occupant owns its button geometry and hover chrome. */
 .footArea {
   flex: none;
+  display: flex;
+  align-items: flex-end;
+  gap: 8px;
+}
+
+.settingsArea {
+  flex: 1;
+  min-width: 0;
+}
+
+.footerActions {
+  flex: none;
+  display: flex;
+  align-items: flex-end;
+}
+
+/* The 56px rail cannot hold two controls side by side. Keep both reachable in
+   the same footer, stacked in their original order. */
+.collapsed .footArea {
+  flex-direction: column;
+  align-items: center;
+  gap: 0;
+}
+
+.collapsed .settingsArea,
+.collapsed .footerActions {
+  flex: none;
+  display: flex;
+  justify-content: center;
 }
 
 @media (prefers-reduced-motion: reduce) {

packages/client/ui-sidebar/src/client/SidebarRoot.tsx

@@ -6,7 +6,7 @@
  * snap to the 56px rail (one icon each, same top-down order) fading in as the
  * slide ends. The workspace/session browsing region between the New Session
  * button and the foot is the `sidebar.workspaces` registrant's, and the foot
- * is the `sidebar.settings` registrant's; the shell hands them the wide flag
+ * holds `sidebar.settings` plus `sidebar.footer.action`; the shell hands them the wide flag
  * (plus an expand request callback for the browser).
  *
  * The column also owns whether the scroll regions nested in it draw a
@@ -177,9 +177,14 @@ export function SidebarRoot({
         })}
       </div>
 
-      {/* Foot seat: ui-settings registers the trigger row + panel here. */}
+      {/* Footer: Settings stays on the left; optional actions sit beside it. */}
       <div className={css.footArea}>
-        {renderSlot('sidebar.settings', { wide })}
+        <div className={css.settingsArea}>
+          {renderSlot('sidebar.settings', { wide })}
+        </div>
+        <div className={css.footerActions}>
+          {renderSlot('sidebar.footer.action', { wide })}
+        </div>
       </div>
     </div>
   )

packages/client/ui-sidebar/src/client/contract/slots.ts

@@ -50,6 +50,12 @@ export interface SidebarSettingsOwnerProps {
   wide: boolean
 }
 
+/** Owner share of an action rendered beside Settings at the sidebar foot. */
+export interface SidebarFooterActionOwnerProps {
+  /** Whether the sidebar renders wide content (false = 56px rail). */
+  wide: boolean
+}
+
 /**
  * Registrant-private injected share (arrives via the register inject
  * factory). The shell keeps only its own controls: starting a Session from
@@ -72,5 +78,6 @@ export type SidebarRootInjected = {
  * seat. No store is registered.
  */
 export type SidebarRootComponentProps =
-  PropsRuntime<'sidebar'> & PropsRenderSlots<'sidebar.workspaces' | 'sidebar.settings'>
+  PropsRuntime<'sidebar'>
+  & PropsRenderSlots<'sidebar.workspaces' | 'sidebar.settings' | 'sidebar.footer.action'>
   & SidebarRootInjected & PropsLocale<'sidebar'>

packages/client/ui-sidebar/src/client/index.ts

@@ -6,7 +6,10 @@ import type { SidebarRootInjected } from './contract/slots.ts'
 import { SidebarRoot } from './SidebarRoot.tsx'
 import { en, zh, type SidebarKey } from './locales.ts'
 
-export type { SidebarRootComponentProps, SidebarRootInjected, SidebarSectionOwnerProps, SidebarSettingsOwnerProps } from './contract/slots.ts'
+export type {
+  SidebarFooterActionOwnerProps, SidebarRootComponentProps, SidebarRootInjected,
+  SidebarSectionOwnerProps, SidebarSettingsOwnerProps,
+} from './contract/slots.ts'
 export type { SidebarKey } from './locales.ts'
 
 declare module '@deepseek-ai/dsh-client-ui-slots' {
@@ -44,6 +47,7 @@ export function apply(ctx: ClientContext): void {
       children: {
         'sidebar.workspaces': { kind: 'single', scope: 'root' },
         'sidebar.settings': { kind: 'single', scope: 'root' },
+        'sidebar.footer.action': { kind: 'list', scope: 'root' },
       },
       inject: injectProps,
     }, SidebarRoot),