Add SPA session validation and buglist, update migration docs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

node_modules/playwright/lib/isomorphic/testServerConnection.js

@@ -29,10 +29,16 @@ var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: tru
 var testServerConnection_exports = {};
 __export(testServerConnection_exports, {
   TestServerConnection: () => TestServerConnection,
+  TestServerConnectionClosedError: () => TestServerConnectionClosedError,
   WebSocketTestServerTransport: () => WebSocketTestServerTransport
 });
 module.exports = __toCommonJS(testServerConnection_exports);
 var events = __toESM(require("./events"));
+class TestServerConnectionClosedError extends Error {
+  constructor() {
+    super("Test server connection closed");
+  }
+}
 class WebSocketTestServerTransport {
   constructor(url) {
     this._ws = new WebSocket(url);
@@ -63,6 +69,7 @@ class TestServerConnection {
     this._onStdioEmitter = new events.EventEmitter();
     this._onTestFilesChangedEmitter = new events.EventEmitter();
     this._onLoadTraceRequestedEmitter = new events.EventEmitter();
+    this._onTestPausedEmitter = new events.EventEmitter();
     this._lastId = 0;
     this._callbacks = /* @__PURE__ */ new Map();
     this._isClosed = false;
@@ -71,6 +78,7 @@ class TestServerConnection {
     this.onStdio = this._onStdioEmitter.event;
     this.onTestFilesChanged = this._onTestFilesChangedEmitter.event;
     this.onLoadTraceRequested = this._onLoadTraceRequestedEmitter.event;
+    this.onTestPaused = this._onTestPausedEmitter.event;
     this._transport = transport;
     this._transport.onmessage((data) => {
       const message = JSON.parse(data);
@@ -98,6 +106,9 @@ class TestServerConnection {
       this._isClosed = true;
       this._onCloseEmitter.fire();
       clearInterval(pingInterval);
+      for (const callback of this._callbacks.values())
+        callback.reject(new TestServerConnectionClosedError());
+      this._callbacks.clear();
     });
   }
   isClosed() {
@@ -127,6 +138,8 @@ class TestServerConnection {
       this._onTestFilesChangedEmitter.fire(params);
     else if (method === "loadTraceRequested")
       this._onLoadTraceRequestedEmitter.fire(params);
+    else if (method === "testPaused")
+      this._onTestPausedEmitter.fire(params);
   }
   async initialize(params) {
     await this._sendMessage("initialize", params);
@@ -207,5 +220,6 @@ class TestServerConnection {
 // Annotate the CommonJS export names for ESM import in node:
 0 && (module.exports = {
   TestServerConnection,
+  TestServerConnectionClosedError,
   WebSocketTestServerTransport
 });