fix(app): stabilize todo dock e2e with composer probe (#17267)

packages/app/src/testing/session-composer.ts

@@ -0,0 +1,84 @@
+import type { Todo } from "@opencode-ai/sdk/v2"
+
+export const composerEvent = "opencode:e2e:composer"
+
+export type ComposerDriverState = {
+  live?: boolean
+  todos?: Array<Pick<Todo, "content" | "status" | "priority">>
+}
+
+export type ComposerProbeState = {
+  mounted: boolean
+  collapsed: boolean
+  hidden: boolean
+  count: number
+  states: Todo["status"][]
+}
+
+type ComposerState = {
+  driver?: ComposerDriverState
+  probe?: ComposerProbeState
+}
+
+export type ComposerWindow = Window & {
+  __opencode_e2e?: {
+    composer?: {
+      enabled?: boolean
+      sessions?: Record<string, ComposerState>
+    }
+  }
+}
+
+const clone = (driver: ComposerDriverState) => ({
+  live: driver.live,
+  todos: driver.todos?.map((todo) => ({ ...todo })),
+})
+
+export const composerEnabled = () => {
+  if (typeof window === "undefined") return false
+  return (window as ComposerWindow).__opencode_e2e?.composer?.enabled === true
+}
+
+const root = () => {
+  if (!composerEnabled()) return
+  const state = (window as ComposerWindow).__opencode_e2e?.composer
+  if (!state) return
+  state.sessions ??= {}
+  return state.sessions
+}
+
+export const composerDriver = (sessionID?: string) => {
+  if (!sessionID) return
+  const state = root()?.[sessionID]?.driver
+  if (!state) return
+  return clone(state)
+}
+
+export const composerProbe = (sessionID?: string) => {
+  const set = (next: ComposerProbeState) => {
+    if (!sessionID) return
+    const sessions = root()
+    if (!sessions) return
+    const prev = sessions[sessionID] ?? {}
+    sessions[sessionID] = {
+      ...prev,
+      probe: {
+        ...next,
+        states: [...next.states],
+      },
+    }
+  }
+
+  return {
+    set,
+    drop() {
+      set({
+        mounted: false,
+        collapsed: false,
+        hidden: true,
+        count: 0,
+        states: [],
+      })
+    },
+  }
+}