fix(ui): move the onboarding takeover chrome into the step

The settings shell painted the onboarding overlay (opaque stage, mask,
#root inert) the moment a step was registered and not locally completed,
while every step still had to load its private join before deciding
whether to show — rendering null could not suppress the shell-owned
chrome. Every reload on the hero therefore flashed a full-screen opaque
layer (white in the light palette) for one settings/credential RPC
round-trip after the session list turned ready.

The chrome now belongs to the step: a new zero-cordis OnboardingSurface
primitive (ui-primitives) renders the body-portaled overlay/mask/stage
verbatim from the former SettingsRoot stylesheet and holds #root inert
for exactly its own lifetime. WelcomeNotice and DeepSeekOnboardingDialog
wrap only their visible branch in it, so their existing null branches
paint and block nothing by construction. SettingsRoot keeps the
coordinator unchanged but renders the elected step bare, and the
settings.onboarding contract now names the surface wrap as the
registrant's obligation.

The onboarding e2e gains a held-join reload scenario pinning that a
configured world never mounts the takeover chrome or inerts the app.

packages/client/ui-models/src/client/DeepSeekOnboardingDialog.tsx

@@ -7,7 +7,7 @@
 import { useEffect, useRef } from 'react'
 import type { ReactNode } from 'react'
 import type { PropsRuntime } from '@deepseek-ai/dsh-client-ui-slots'
-import { BrandWordmark, Button } from '@deepseek-ai/dsh-client-ui-primitives'
+import { BrandWordmark, Button, OnboardingSurface } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { SnapshotSelectorHook } from '@deepseek-ai/dsh-client-web-react'
 import type { ModelsSettingsState, ModelsSettingsStore } from './store.ts'
 import { deepSeekReadiness } from './store.ts'
@@ -66,6 +66,9 @@ export function DeepSeekOnboardingDialog(props: DeepSeekOnboardingDialogProps):
     openSection('models')
   }
 
+  // Null covers the still-deciding and nothing-to-do states alike: the
+  // takeover chrome below is part of THIS render, so declining paints and
+  // blocks nothing while the shared join is in flight.
   switch (readiness.kind) {
     case 'loading':
     case 'adapter-absent':
@@ -80,25 +83,27 @@ export function DeepSeekOnboardingDialog(props: DeepSeekOnboardingDialogProps):
   }
 
   return (
-    <section className={styles['page']} role="region" aria-labelledby="deepseek-onboarding-title">
-      <div className={styles['brand']} aria-hidden="true"><BrandWordmark size={24} /></div>
-      <h2
-        ref={titleRef}
-        id="deepseek-onboarding-title"
-        className={styles['title']}
-        tabIndex={-1}
-      >
-        {t('onboardingTitle')}
-      </h2>
-      <p className={styles['description']}>{t('onboardingDescription')}</p>
-      <div className={styles['actions']}>
-        <Button variant="ghost" className={styles['later']} onClick={complete}>
-          {t('onboardingLater')}
-        </Button>
-        <Button variant="primary" className={styles['primary']} onClick={openModels}>
-          {t('onboardingGoToSettings')}
-        </Button>
-      </div>
-    </section>
+    <OnboardingSurface>
+      <section className={styles['page']} role="region" aria-labelledby="deepseek-onboarding-title">
+        <div className={styles['brand']} aria-hidden="true"><BrandWordmark size={24} /></div>
+        <h2
+          ref={titleRef}
+          id="deepseek-onboarding-title"
+          className={styles['title']}
+          tabIndex={-1}
+        >
+          {t('onboardingTitle')}
+        </h2>
+        <p className={styles['description']}>{t('onboardingDescription')}</p>
+        <div className={styles['actions']}>
+          <Button variant="ghost" className={styles['later']} onClick={complete}>
+            {t('onboardingLater')}
+          </Button>
+          <Button variant="primary" className={styles['primary']} onClick={openModels}>
+            {t('onboardingGoToSettings')}
+          </Button>
+        </div>
+      </section>
+    </OnboardingSurface>
   )
 }