Fix Studio chat history and attachments with newer assistant-ui (#5296)

Pass Studio history, dictation, and attachment adapters directly into useLocalRuntime instead of relying on assistant-ui's unstable_Provider ordering, which fixes blank chat threads on reload and broken image upload / drag-drop on fresh PyPI and curl installs that resolved @assistant-ui/react to the newer _RuntimeBinder path.

Also pins @assistant-ui/react, @assistant-ui/react-markdown, @assistant-ui/react-streamdown, and assistant-stream to exact versions in package.json so future installs cannot silently re-float onto a newer pre-1.0 release. The lockfile alone only fixes resolution for the install that consumes it -- a future bun add / npm install <other-pkg> rewrites the lockfile and is free to drift carets within their range, which is exactly the path that pulled @assistant-ui/react from 0.12.19 to 0.12.28 and broke 2026.5.1.

Adds studio/frontend/package-lock.json so npm fallback / fresh installs have deterministic resolution.

Tests:
- bun run typecheck
- npm ci on a clean tree (1083 packages)
- npm run build (bundle no longer contains the unstable_Provider Studio call site; only assistant-ui internals reference unstable_Provider)

studio/frontend/package.json

@@ -17,9 +17,9 @@
   },
   "dependencies": {
     "@assistant-ui/core": "0.1.17",
-    "@assistant-ui/react": "^0.12.19",
-    "@assistant-ui/react-markdown": "^0.12.3",
-    "@assistant-ui/react-streamdown": "^0.1.2",
+    "@assistant-ui/react": "0.12.28",
+    "@assistant-ui/react-markdown": "0.12.11",
+    "@assistant-ui/react-streamdown": "0.1.11",
     "@base-ui/react": "^1.2.0",
     "@dagrejs/dagre": "^2.0.4",
     "@dagrejs/graphlib": "^3.0.4",
@@ -51,7 +51,7 @@
     "@toolwind/corner-shape": "^0.0.8-3",
     "@types/canvas-confetti": "^1.9.0",
     "@xyflow/react": "^12.10.0",
-    "assistant-stream": "^0.3.2",
+    "assistant-stream": "0.3.12",
     "canvas-confetti": "^1.9.4",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",

studio/frontend/src/features/chat/runtime-provider.tsx

@@ -9,8 +9,8 @@ import {
   ExportedMessageRepository,
   type ExportedMessageRepositoryItem,
   type PendingAttachment,
-  RuntimeAdapterProvider,
   Suggestions,
+  type LocalRuntimeOptions,
   type ThreadHistoryAdapter,
   type ThreadMessage,
   WebSpeechDictationAdapter,
@@ -583,9 +583,9 @@ function createDexieAdapter(
   };
 }
 
-function ThreadHistoryProvider({
-  children,
-}: { children?: ReactNode }): ReactElement {
+type StudioRuntimeAdapters = NonNullable<LocalRuntimeOptions["adapters"]>;
+
+function useStudioRuntimeAdapters(): StudioRuntimeAdapters {
   const aui = useAui();
 
   const history = useMemo<ThreadHistoryAdapter>(
@@ -711,17 +711,14 @@ function ThreadHistoryProvider({
     [history, dictation, attachments],
   );
 
-  return (
-    <RuntimeAdapterProvider adapters={adapters}>
-      {children}
-    </RuntimeAdapterProvider>
-  );
+  return adapters;
 }
 
 const chatAdapter = createOpenAIStreamAdapter();
 
 function useRuntimeHook(): ReturnType<typeof useLocalRuntime> {
-  return useLocalRuntime(chatAdapter);
+  const adapters = useStudioRuntimeAdapters();
+  return useLocalRuntime(chatAdapter, { adapters });
 }
 
 function ThreadAutoSwitch({
@@ -898,10 +895,7 @@ export function ChatRuntimeProvider({
 }): ReactElement {
   const runtime = useRemoteThreadListRuntime({
     runtimeHook: useRuntimeHook,
-    adapter: {
-      ...createDexieAdapter(modelType, pairId),
-      unstable_Provider: ThreadHistoryProvider,
-    },
+    adapter: createDexieAdapter(modelType, pairId),
   });
 
   const aui = useAui({