fix(app): separate provider lifetimes and reactive ownership (#33739)

packages/app/test-browser/prompt-scope.test.ts

@@ -0,0 +1,14 @@
+import { expect, test } from "bun:test"
+import { ServerConnection } from "@/context/server"
+import { selectPromptTab } from "@/context/prompt"
+import type { Tab } from "@/context/tabs"
+
+test("selects the explicitly scoped session tab instead of the active tab", () => {
+  const server = ServerConnection.Key.make("local")
+  const tabs: Tab[] = [
+    { type: "session", server, sessionId: "A" },
+    { type: "session", server, sessionId: "B" },
+  ]
+
+  expect(selectPromptTab(tabs, { dir: "repo", id: "B" }, server)).toBe(tabs[1])
+})