chore: import upstream snapshot with attribution

apps/sim/lib/auth/session-response.ts

@@ -0,0 +1,43 @@
+/**
+ * The app-facing session shape derived from the Better Auth client response.
+ * Lives here (the module that produces it) so both the `useSessionQuery` hook
+ * and the `SessionProvider` can import it without a provider ↔ hook import cycle.
+ */
+export type AppSession = {
+  user: {
+    id: string
+    email: string
+    emailVerified?: boolean
+    name?: string | null
+    image?: string | null
+    role?: string
+    createdAt?: Date
+    updatedAt?: Date
+  } | null
+  session?: {
+    id?: string
+    userId?: string
+    activeOrganizationId?: string
+    impersonatedBy?: string | null
+  }
+} | null
+
+export function extractSessionDataFromAuthClientResult(result: unknown): unknown | null {
+  if (!result || typeof result !== 'object') {
+    return null
+  }
+
+  const record = result as Record<string, unknown>
+
+  // Expected shape from better-auth client: { data: <session> }
+  if ('data' in record) {
+    return (record as { data?: unknown }).data ?? null
+  }
+
+  // Fallback for raw session payloads: { user, session }
+  if ('user' in record) {
+    return record
+  }
+
+  return null
+}