feat(sessions): default cloud sessions to steer mode

Scope the steer default to cloud runs only: useMessagingMode now falls back to steer when the task's session is a cloud session, otherwise keeps the global default (queue). Local session behavior is unchanged; per-task overrides and the global Setting still win.

Generated-By: PostHog Code
Task-Id: 0736d6b4-abdb-46ea-9c53-2b8287d1dc74

Author: tatoalo

packages/ui/src/features/sessions/hooks/useMessagingMode.ts

@@ -4,15 +4,21 @@ import {
   useMessagingModeStore,
 } from "@posthog/ui/features/sessions/messagingModeStore";
 import { useSessionStore } from "@posthog/ui/features/sessions/sessionStore";
+import { useSessionIsCloud } from "@posthog/ui/features/sessions/useSession";
 import { useSettingsStore } from "@posthog/ui/features/settings/settingsStore";
 
-/** Effective messaging mode for a task: per-task override, else global default. */
+/**
+ * Effective messaging mode for a task: per-task override, else cloud sessions
+ * default to steer (mid-turn messages keep cloud runs on track without waiting
+ * for the turn to end), else the global default from settings.
+ */
 export function useMessagingMode(taskId: string | undefined): MessagingMode {
   const override = useMessagingModeStore((s) =>
     taskId ? s.modesByTaskId[taskId] : undefined,
   );
+  const isCloud = useSessionIsCloud(taskId);
   const globalDefault = useSettingsStore((s) => s.defaultMessagingMode);
-  return override ?? globalDefault;
+  return override ?? (isCloud ? "steer" : globalDefault);
 }
 
 /**

packages/ui/src/features/settings/settingsStore.ts

@@ -319,7 +319,7 @@ export const useSettingsStore = create<SettingsStore>()(
       lastUsedInitialTaskMode: "plan",
       lastPlanApprovalMode: null,
       defaultReasoningEffort: "last_used",
-      defaultMessagingMode: "steer",
+      defaultMessagingMode: "queue",
       setDefaultRunMode: (mode) => set({ defaultRunMode: mode }),
       setLastUsedRunMode: (mode) => set({ lastUsedRunMode: mode }),
       setLastUsedLocalWorkspaceMode: (mode) =>