chore(chatbot): upgrade to Vercel AI SDK v7 / @ai-sdk/react v4 (#2101)

Bump `ai` ^6 -> ^7 and `@ai-sdk/react` ^3 -> ^4 in @object-ui/plugin-chatbot.
useChat / DefaultChatTransport / UIMessage usage is source-compatible with v7 —
no code changes needed. Type-check clean, build green, 183/183 tests pass.

Part of the AI SDK v6->v7 upgrade (framework#2464, cloud#710).

Co-authored-by: Jack Zhuang <277994282+os-zhuang@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: os-zhuang

.changeset/ai-sdk-v7-chatbot.md

@@ -0,0 +1,14 @@
+---
+'@object-ui/plugin-chatbot': minor
+---
+
+chore(chatbot): upgrade to Vercel AI SDK v7 / @ai-sdk/react v4
+
+Bump `ai` ^6 -> ^7 and `@ai-sdk/react` ^3 -> ^4. The chatbot's `useChat`,
+`DefaultChatTransport`, `UIMessage`/`ChatStatus` usage and the `mapMessages`
+parts adapter are all source-compatible with v7 — no code changes required.
+
+Verified: type-check clean, build green, 183/183 unit tests pass on v7.
+
+Part of the org-wide AI SDK v6->v7 / providers v3->v4 upgrade (framework#2464,
+cloud#710).

packages/plugin-chatbot/package.json

@@ -31,14 +31,14 @@
     "lint": "eslint ."
   },
   "dependencies": {
-    "@ai-sdk/react": "^3.0.216",
+    "@ai-sdk/react": "^4.0.5",
     "@object-ui/components": "workspace:*",
     "@object-ui/core": "workspace:*",
     "@object-ui/react": "workspace:*",
     "@object-ui/types": "workspace:*",
     "@radix-ui/react-slot": "^1.3.0",
     "@radix-ui/react-use-controllable-state": "^1.2.3",
-    "ai": "^6.0.214",
+    "ai": "^7.0.4",
     "class-variance-authority": "^0.7.1",
     "lucide-react": "^1.22.0",
     "motion": "^12.42.0",