fix: 将 pipeIpc 添加到 AppState 类型声明，消除 4 个 as any

- AppStateStore: 添加 pipeIpc?: PipeIpcState 可选字段
- PromptInputFooter: 直接访问 s.pipeIpc
- useBackgroundTaskNavigation: 直接访问 s.pipeIpc
- usePipeRouter: 直接访问 store.getState().pipeIpc
- REPL.tsx: 移除 getPipeIpc(s as any) 中的 as any

precheck 通过

src/state/AppStateStore.ts

@@ -36,6 +36,7 @@ import type { PermissionMode } from '../utils/permissions/PermissionMode.js'
 import { getInitialSettings } from '../utils/settings/settings.js'
 import type { SettingsJson } from '../utils/settings/types.js'
 import { shouldEnableThinkingByDefault } from '../utils/thinking.js'
+import type { PipeIpcState } from '../utils/pipeTransport.js'
 import type { Store } from './store.js'
 
 export type CompletionBoundary =
@@ -159,6 +160,8 @@ export type AppState = DeepImmutable<{
   replBridgeInitialName: string | undefined
   // Always-on bridge: first-time remote dialog pending (set by /remote-control command)
   showRemoteCallout: boolean
+  // Pipe IPC state — added at runtime when feature('PIPE_IPC') is enabled.
+  pipeIpc?: PipeIpcState
 }> & {
   // Unified task state - excluded from DeepImmutable because TaskState contains function types
   tasks: { [taskId: string]: TaskState }