feat(web): add versioned first-run welcome

packages/client/ui-settings/src/client/SettingsRoot.tsx

@@ -6,8 +6,8 @@
  * names resolve to that content (trigger: its own text; dialog:
  * aria-labelledby the title node; close: visually-hidden slot text). Modal
  * open state and the active section id are component-local viewing state;
- * the onboarding slot receives the sessions-derived empty-Hero fact and a
- * private callback that opens one registered section.
+ * the onboarding coordinator mounts exactly one ordered registrant while the
+ * sessions-derived empty-Hero fact is active.
  */
 import { useCallback, useEffect, useId, useRef, useState } from 'react'
 import clsx from 'clsx'
@@ -95,9 +95,10 @@ function SettingsPanel({ rows, renderSlot, activeId, onSelect, onClose }: PanelP
  * @returns the settings shell element tree.
  */
 export function SettingsRoot(props: SettingsRootComponentProps) {
-  const { wide, useSections, useSessions, renderSlot } = props
+  const { wide, useSections, useOnboardingSteps, useSessions, renderSlot } = props
   const [open, setOpen] = useState(false)
   const [activeId, setActiveId] = useState<string | undefined>(undefined)
+  const [completedOnboarding, setCompletedOnboarding] = useState<ReadonlySet<string>>(() => new Set())
   const close = useCallback(() => {
     setOpen(false)
     setActiveId(undefined)
@@ -111,9 +112,25 @@ export function SettingsRoot(props: SettingsRootComponentProps) {
   // freshly localized text on locale change, and the trigger/header/close
   // seats re-render through their own outlets' subscriptions.
   const rows = useSections(s => s)
+  const onboardingSteps = useOnboardingSteps(s => s)
   const onboardingActive = useSessions(state =>
     state.phase === 'ready'
     && (state.current === undefined || state.byId[state.current]?.blank === true))
+  const onboardingStep = onboardingActive
+    ? onboardingSteps.find(step => !completedOnboarding.has(step.id))
+    : undefined
+
+  useEffect(() => {
+    if (onboardingActive) return
+    setCompletedOnboarding(new Set())
+  }, [onboardingActive])
+
+  const completeOnboardingStep = useCallback((id: string) => {
+    setCompletedOnboarding((previous) => {
+      if (previous.has(id)) return previous
+      return new Set([...previous, id])
+    })
+  }, [])
 
   return (
     <>
@@ -135,7 +152,11 @@ export function SettingsRoot(props: SettingsRootComponentProps) {
           onClose={close}
         />
       )}
-      {renderSlot('settings.onboarding', { active: onboardingActive, openSection })}
+      {onboardingStep !== undefined && renderSlot('settings.onboarding', {
+        stepId: onboardingStep.id,
+        complete: () => { completeOnboardingStep(onboardingStep.id) },
+        openSection,
+      }, { only: onboardingStep.id })}
     </>
   )
 }

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

@@ -48,10 +48,10 @@ declare module '@deepseek-ai/dsh-client-ui-slots' {
      */
     'settings.section': { kind: 'list'; scope: 'root'; owner: SettingsSectionOwnerProps }
     /**
-     * Root-scoped onboarding overlays contributed by settings features. The
-     * shell supplies whether the current navigation state is the empty Hero
-     * and a private callback that opens one settings section; registrants own
-     * readiness, copy, and dialog behavior.
+     * Root-scoped onboarding steps contributed by settings features. The
+     * shell mounts one ordered step at a time; the active registrant either
+     * completes itself or keeps ownership until the user completes its sole
+     * path. Registrants own readiness, copy, and dialog behavior.
      */
     'settings.onboarding': { kind: 'list'; scope: 'root'; owner: SettingsOnboardingOwnerProps }
   }
@@ -79,10 +79,12 @@ export interface SettingsSectionOwnerProps {
   children?: never
 }
 
-/** Owner share of a settings-backed onboarding overlay. */
+/** Owner share of the currently active settings-backed onboarding step. */
 export interface SettingsOnboardingOwnerProps {
-  /** Whether the current UI is in its empty Hero/onboarding state. */
-  active: boolean
+  /** Stable id of the step currently selected by the coordinator. */
+  stepId: string
+  /** Complete or skip this step and transfer ownership to the next entry. */
+  complete: () => void
   /** Open the settings panel directly on one registered section. */
   openSection: (id: string) => void
 }
@@ -94,6 +96,12 @@ export interface SettingsSectionRow {
   label: string
 }
 
+/** One ordered onboarding step projected from a slot registration. */
+export interface SettingsOnboardingStep {
+  id: string
+  order: number
+}
+
 /**
  * Registrant-private injected share of the settings shell (assembled in
  * apply): the ledger's nav-row projection as a hooks-compartment source —
@@ -103,6 +111,8 @@ export type SettingsRootInjected = {
   hooks: {
     /** settings.section ledger projected into ordered nav rows. */
     sections: HostObservable<readonly SettingsSectionRow[]>
+    /** settings.onboarding ledger projected into coordinator order. */
+    onboardingSteps: HostObservable<readonly SettingsOnboardingStep[]>
   }
 }
 

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

@@ -9,12 +9,15 @@
  */
 import type { ClientContext } from '@deepseek-ai/dsh-client-runtime/client'
 import { deferRegistration } from '@deepseek-ai/dsh-client-ui-slots'
-import type { SettingsRootInjected, SettingsSectionRow } from './contract/slots.ts'
+import type {
+  SettingsOnboardingStep, SettingsRootInjected, SettingsSectionRow,
+} from './contract/slots.ts'
 import { SettingsRoot } from './SettingsRoot.tsx'
 
 export type {
   SettingsHeaderOwnerProps, SettingsRootComponentProps, SettingsRootInjected,
-  SettingsOnboardingOwnerProps, SettingsSectionOwnerProps, SettingsSectionRow, SettingsTriggerOwnerProps,
+  SettingsOnboardingOwnerProps, SettingsOnboardingStep, SettingsSectionOwnerProps,
+  SettingsSectionRow, SettingsTriggerOwnerProps,
 } from './contract/slots.ts'
 
 /**
@@ -35,6 +38,8 @@ export function apply(ctx: ClientContext): void {
   // getSnapshot returns the cached rows until the ledger version moves).
   let rowsVersion = -1
   let rows: readonly SettingsSectionRow[] = []
+  let onboardingVersion = -1
+  let onboardingSteps: readonly SettingsOnboardingStep[] = []
   const injected = (): SettingsRootInjected => ({
     hooks: {
       sections: {
@@ -55,6 +60,23 @@ export function apply(ctx: ClientContext): void {
         },
         subscribe: listener => ctx.slots.subscribe('settings.section', listener),
       },
+      onboardingSteps: {
+        getSnapshot: () => {
+          const version = ctx.slots.getVersion('settings.onboarding')
+          if (version !== onboardingVersion) {
+            onboardingVersion = version
+            onboardingSteps = ctx.slots.entries('settings.onboarding')
+              .map(e => ({
+                /* v8 ignore next -- list-slot registration requires id */
+                id: e.options.id ?? '',
+                order: e.options.order ?? 0,
+              }))
+              .sort((a, b) => a.order - b.order)
+          }
+          return onboardingSteps
+        },
+        subscribe: listener => ctx.slots.subscribe('settings.onboarding', listener),
+      },
     },
   })
   ctx.effect(() => {