fix(desktop): surface provider onboarding from session warnings

Propagate credential warnings through session runtime info and open desktop onboarding whenever a session reports no usable provider, so unconfigured installs cannot fall through to prompt errors.

apps/desktop/src/app/session/hooks/use-message-stream.ts

@@ -17,6 +17,7 @@ import { coerceGatewayText, coerceThinkingText, normalizePersonalityValue } from
 import { triggerHaptic } from '@/lib/haptics'
 import { setClarifyRequest } from '@/store/clarify'
 import { notify } from '@/store/notifications'
+import { requestDesktopOnboarding } from '@/store/onboarding'
 import {
   setCurrentBranch,
   setCurrentCwd,
@@ -476,6 +477,10 @@ export function useMessageStream({
           setCurrentUsage(current => ({ ...current, ...payload.usage }))
         }
 
+        if (typeof payload?.credential_warning === 'string' && payload.credential_warning) {
+          requestDesktopOnboarding(payload.credential_warning)
+        }
+
         void refreshHermesConfig()
 
         if (modelChanged || providerChanged) {

apps/desktop/src/app/session/hooks/use-session-actions.ts

@@ -9,6 +9,7 @@ import { embeddedImageUrls, textWithoutEmbeddedImages } from '@/lib/embedded-ima
 import { clearComposerAttachments, clearComposerDraft } from '@/store/composer'
 import { $pinnedSessionIds } from '@/store/layout'
 import { clearNotifications, notify, notifyError } from '@/store/notifications'
+import { requestDesktopOnboarding } from '@/store/onboarding'
 import {
   $messages,
   $sessions,
@@ -187,6 +188,10 @@ function applyRuntimeInfo(info: SessionCreateResponse['info'] | undefined) {
     return
   }
 
+  if (info.credential_warning) {
+    requestDesktopOnboarding(info.credential_warning)
+  }
+
   if (info.model) {
     setCurrentModel(info.model)
   }

apps/desktop/src/lib/chat-messages.ts

@@ -39,6 +39,7 @@ export type GatewayEventPayload = {
   running?: boolean
   cwd?: string
   branch?: string
+  credential_warning?: string
   personality?: string
   usage?: Partial<UsageStats>
   // clarify.request

apps/desktop/src/types/hermes.ts

@@ -164,6 +164,8 @@ export interface SessionResumeResponse {
 
 export interface SessionRuntimeInfo {
   branch?: string
+  config_warning?: string
+  credential_warning?: string
   cwd?: string
   fast?: boolean
   model?: string

tui_gateway/server.py

@@ -583,9 +583,6 @@ def _start_agent_build(sid: str, session: dict) -> None:
             _notify_session_boundary("on_session_reset", key)
 
             info = _session_info(agent, current)
-            warn = _probe_credentials(agent)
-            if warn:
-                info["credential_warning"] = warn
             cfg_warn = _probe_config_health(_load_cfg())
             if cfg_warn:
                 info["config_warning"] = cfg_warn
@@ -1513,6 +1510,9 @@ def _session_info(agent, session: dict | None = None) -> dict:
         info["update_command"] = recommended_update_command()
     except Exception:
         pass
+    warn = _probe_credentials(agent)
+    if warn:
+        info["credential_warning"] = warn
     return info