Implement comprehensive frontend integration testing with Playwright

- Add Playwright E2E testing framework with cross-browser support (Chrome, Firefox)
- Create authentication helpers for CalDAV server integration
- Implement calendar interaction helpers with event creation, drag-and-drop, and view switching
- Add comprehensive drag-and-drop test suite with event cleanup
- Configure CI/CD integration with Gitea Actions for headless testing
- Support both local development and CI environments with proper dependency management
- Include video recording, screenshots, and HTML reporting for test debugging
- Handle Firefox-specific timing and interaction challenges with force clicks and timeouts

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

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

frontend/e2e/node_modules/playwright/lib/common/esmLoaderHost.js

@@ -0,0 +1,102 @@
+"use strict";
+var __create = Object.create;
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __getProtoOf = Object.getPrototypeOf;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __export = (target, all) => {
+  for (var name in all)
+    __defProp(target, name, { get: all[name], enumerable: true });
+};
+var __copyProps = (to, from, except, desc) => {
+  if (from && typeof from === "object" || typeof from === "function") {
+    for (let key of __getOwnPropNames(from))
+      if (!__hasOwnProp.call(to, key) && key !== except)
+        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
+  }
+  return to;
+};
+var __toESM = (mod, isNodeMode, target) => (target = mod != null ? __create(__getProtoOf(mod)) : {}, __copyProps(
+  // If the importer is in node compatibility mode or this is not an ESM
+  // file that has been converted to a CommonJS file using a Babel-
+  // compatible transform (i.e. "__esModule" has not been set), then set
+  // "default" to the CommonJS "module.exports" for node compatibility.
+  isNodeMode || !mod || !mod.__esModule ? __defProp(target, "default", { value: mod, enumerable: true }) : target,
+  mod
+));
+var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
+var esmLoaderHost_exports = {};
+__export(esmLoaderHost_exports, {
+  configureESMLoader: () => configureESMLoader,
+  configureESMLoaderTransformConfig: () => configureESMLoaderTransformConfig,
+  incorporateCompilationCache: () => incorporateCompilationCache,
+  registerESMLoader: () => registerESMLoader,
+  startCollectingFileDeps: () => startCollectingFileDeps,
+  stopCollectingFileDeps: () => stopCollectingFileDeps
+});
+module.exports = __toCommonJS(esmLoaderHost_exports);
+var import_url = __toESM(require("url"));
+var import_compilationCache = require("../transform/compilationCache");
+var import_portTransport = require("../transform/portTransport");
+var import_transform = require("../transform/transform");
+let loaderChannel;
+function registerESMLoader() {
+  if (process.env.PW_DISABLE_TS_ESM)
+    return true;
+  if (loaderChannel)
+    return true;
+  const register = require("node:module").register;
+  if (!register)
+    return false;
+  const { port1, port2 } = new MessageChannel();
+  register(import_url.default.pathToFileURL(require.resolve("../transform/esmLoader")), {
+    data: { port: port2 },
+    transferList: [port2]
+  });
+  loaderChannel = createPortTransport(port1);
+  return true;
+}
+function createPortTransport(port) {
+  return new import_portTransport.PortTransport(port, async (method, params) => {
+    if (method === "pushToCompilationCache")
+      (0, import_compilationCache.addToCompilationCache)(params.cache);
+  });
+}
+async function startCollectingFileDeps() {
+  if (!loaderChannel)
+    return;
+  await loaderChannel.send("startCollectingFileDeps", {});
+}
+async function stopCollectingFileDeps(file) {
+  if (!loaderChannel)
+    return;
+  await loaderChannel.send("stopCollectingFileDeps", { file });
+}
+async function incorporateCompilationCache() {
+  if (!loaderChannel)
+    return;
+  const result = await loaderChannel.send("getCompilationCache", {});
+  (0, import_compilationCache.addToCompilationCache)(result.cache);
+}
+async function configureESMLoader() {
+  if (!loaderChannel)
+    return;
+  await loaderChannel.send("setSingleTSConfig", { tsconfig: (0, import_transform.singleTSConfig)() });
+  await loaderChannel.send("addToCompilationCache", { cache: (0, import_compilationCache.serializeCompilationCache)() });
+}
+async function configureESMLoaderTransformConfig() {
+  if (!loaderChannel)
+    return;
+  await loaderChannel.send("setSingleTSConfig", { tsconfig: (0, import_transform.singleTSConfig)() });
+  await loaderChannel.send("setTransformConfig", { config: (0, import_transform.transformConfig)() });
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  configureESMLoader,
+  configureESMLoaderTransformConfig,
+  incorporateCompilationCache,
+  registerESMLoader,
+  startCollectingFileDeps,
+  stopCollectingFileDeps
+});