feat(web): combine plugin settings into tabs

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

@@ -51,6 +51,15 @@ declare module '@deepseek-ai/dsh-client-ui-slots' {
      * item registrant; the shell neither declares nor renders it.)
      */
     'settings.section': { kind: 'list'; scope: 'root'; owner: SettingsSectionOwnerProps }
+    /**
+     * One page inside the Plugins settings section. The section owner renders
+     * localized entry labels as tabs and mounts each contribution inside its
+     * corresponding tab panel. Options: `id` (tab key), `order` (tab order),
+     * and `label` (registrant-localized tab text). Declared at runtime by the
+     * feature that owns the Plugins section; the type lives here so inventory
+     * and configuration plugins collaborate without depending on one another.
+     */
+    'settings.plugins.tab': { kind: 'list'; scope: 'root'; owner: SettingsPluginsTabOwnerProps }
     /**
      * Root-scoped onboarding steps contributed by settings features. The
      * shell mounts one ordered step at a time; the active registrant either
@@ -83,6 +92,12 @@ export interface SettingsGeneralItemOwnerProps {
   children?: never
 }
 
+/** Owner share of a Plugins tab (the section supplies nothing). */
+export interface SettingsPluginsTabOwnerProps {
+  /** Marker field: tab owner props are intentionally empty. */
+  children?: never
+}
+
 /** Owner share of the trigger content seat: the sidebar column state. */
 export interface SettingsTriggerOwnerProps {
   /** Whether the sidebar renders wide content (false = 56px rail, icon only). */

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

@@ -13,7 +13,7 @@ import { SettingsScopeService } from './settings-scope.ts'
 
 export type {
   SettingsGeneralItemOwnerProps, SettingsHeaderOwnerProps, SettingsOnboardingOwnerProps,
-  SettingsSectionOwnerProps, SettingsTriggerOwnerProps,
+  SettingsPluginsTabOwnerProps, SettingsSectionOwnerProps, SettingsTriggerOwnerProps,
 } from './contract/slots.ts'
 export { SettingsScopeController, SettingsScopeService } from './settings-scope.ts'