fix(test): add _resetForTesting to all session state tests

src/hooks/session-notification.test.ts

@@ -1,7 +1,7 @@
 import { describe, expect, test, beforeEach, afterEach, spyOn } from "bun:test"
 
 import { createSessionNotification } from "./session-notification"
-import { setMainSession, subagentSessions } from "../features/claude-code-session-state"
+import { setMainSession, subagentSessions, _resetForTesting } from "../features/claude-code-session-state"
 import * as utils from "./session-notification-utils"
 
 describe("session-notification", () => {
@@ -30,6 +30,7 @@ describe("session-notification", () => {
   }
 
   beforeEach(() => {
+    _resetForTesting()
     notificationCalls = []
     
     spyOn(utils, "getOsascriptPath").mockResolvedValue("/usr/bin/osascript")