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

packages/app/test-browser/prompt-transient-state.test.ts

@@ -0,0 +1,36 @@
+import { expect, test } from "bun:test"
+import { createRoot, createSignal } from "solid-js"
+import { createPromptInputTransientState } from "@/components/prompt-input/transient-state"
+
+test("resets transient prompt input state when the prompt session changes", () => {
+  createRoot((dispose) => {
+    const [identity, setIdentity] = createSignal("A")
+    const [state, setState] = createPromptInputTransientState(identity, 3)
+    setState({
+      popover: "slash",
+      historyIndex: 2,
+      savedPrompt: {
+        prompt: [{ type: "text", content: "draft-A", start: 0, end: 7 }],
+        comments: [],
+      },
+      draggingType: "image",
+      mode: "shell",
+      applyingHistory: true,
+      variantOpen: true,
+    })
+
+    setIdentity("B")
+
+    expect(state).toMatchObject({
+      popover: null,
+      historyIndex: -1,
+      savedPrompt: null,
+      placeholder: 3,
+      draggingType: null,
+      mode: "normal",
+      applyingHistory: false,
+      variantOpen: false,
+    })
+    dispose()
+  })
+})