test(auto-update-checker): type background update bun install mock

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/auto-update-checker/hook/background-update-check.test.ts

@@ -1,6 +1,12 @@
-import type { PluginInput } from "@opencode-ai/plugin"
+/// <reference types="bun-types" />
+
+import type { BunInstallResult } from "../../../cli/config-manager"
 import { beforeEach, describe, expect, it, mock } from "bun:test"
 
+type PluginInput = {
+  directory: string
+}
+
 type PluginEntry = {
   entry: string
   isPinned: boolean
@@ -31,7 +37,7 @@ const mockSyncCachePackageJsonToIntent = mock((_pluginEntry: PluginEntry) => {
 const mockInvalidatePackage = mock((_packageName: string) => {
   operationOrder.push("invalidate")
 })
-const mockRunBunInstallWithDetails = mock(async () => ({ success: true }))
+const mockRunBunInstallWithDetails = mock(async (): Promise<BunInstallResult> => ({ success: true }))
 const mockShowUpdateAvailableToast = mock(
   async (_ctx: PluginInput, _latestVersion: string, _getToastMessage: ToastMessageGetter): Promise<void> => {}
 )
@@ -90,6 +96,13 @@ describe("runBackgroundUpdateCheck", () => {
 
     operationOrder.length = 0
 
+    mockSyncCachePackageJsonToIntent.mockImplementation((_pluginEntry: PluginEntry) => {
+      operationOrder.push("sync")
+    })
+    mockInvalidatePackage.mockImplementation((_packageName: string) => {
+      operationOrder.push("invalidate")
+    })
+
     pluginEntry = createPluginEntry()
     mockFindPluginEntry.mockReturnValue(pluginEntry)
     mockGetCachedVersion.mockReturnValue("3.4.0")