Green the jsdom lane for the composer-seat ResizeObserver and new StatsLine format

The seat's height publisher needs a ResizeObserver stub in every spec that
renders ConversationRoot (jsdom has none), and the two branch-tail StatsLine
assertions move to the grouped detail-row output.

packages/client/ui-conversation/tests/chat-toolview-slot.spec.tsx

@@ -21,10 +21,21 @@ import type { ToolRowProps } from '@deepseek-ai/dsh-client-ui-conversation/clien
 
 const SID = 's1' as SessionId
 
-afterEach(cleanup)
+/** jsdom has no ResizeObserver; the composer seat publishes its height through one. */
+class ResizeObserverStub {
+  observe(): void {}
+  unobserve(): void {}
+  disconnect(): void {}
+}
+
+afterEach(() => {
+  cleanup()
+  vi.unstubAllGlobals()
+})
 // The chat store persists under its declared key; clear between cases.
 beforeEach(() => {
   localStorage.clear()
+  vi.stubGlobal('ResizeObserver', ResizeObserverStub)
 })
 
 const toolResult = (seq: number, callId: string, name: string, args = '{"command":"make build","description":"Build"}'): ToolResultNode => ({