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/testLoader.js

@@ -0,0 +1,100 @@
+"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 testLoader_exports = {};
+__export(testLoader_exports, {
+  defaultTimeout: () => defaultTimeout,
+  loadTestFile: () => loadTestFile
+});
+module.exports = __toCommonJS(testLoader_exports);
+var import_path = __toESM(require("path"));
+var import_util = __toESM(require("util"));
+var esmLoaderHost = __toESM(require("./esmLoaderHost"));
+var import_globals = require("./globals");
+var import_test = require("./test");
+var import_compilationCache = require("../transform/compilationCache");
+var import_transform = require("../transform/transform");
+var import_util2 = require("../util");
+const defaultTimeout = 3e4;
+const cachedFileSuites = /* @__PURE__ */ new Map();
+async function loadTestFile(file, rootDir, testErrors) {
+  if (cachedFileSuites.has(file))
+    return cachedFileSuites.get(file);
+  const suite = new import_test.Suite(import_path.default.relative(rootDir, file) || import_path.default.basename(file), "file");
+  suite._requireFile = file;
+  suite.location = { file, line: 0, column: 0 };
+  (0, import_globals.setCurrentlyLoadingFileSuite)(suite);
+  if (!(0, import_globals.isWorkerProcess)()) {
+    (0, import_compilationCache.startCollectingFileDeps)();
+    await esmLoaderHost.startCollectingFileDeps();
+  }
+  try {
+    await (0, import_transform.requireOrImport)(file);
+    cachedFileSuites.set(file, suite);
+  } catch (e) {
+    if (!testErrors)
+      throw e;
+    testErrors.push(serializeLoadError(file, e));
+  } finally {
+    (0, import_globals.setCurrentlyLoadingFileSuite)(void 0);
+    if (!(0, import_globals.isWorkerProcess)()) {
+      (0, import_compilationCache.stopCollectingFileDeps)(file);
+      await esmLoaderHost.stopCollectingFileDeps(file);
+    }
+  }
+  {
+    const files = /* @__PURE__ */ new Set();
+    suite.allTests().map((t) => files.add(t.location.file));
+    if (files.size === 1) {
+      const mappedFile = files.values().next().value;
+      if (suite.location.file !== mappedFile) {
+        if (import_path.default.extname(mappedFile) !== import_path.default.extname(suite.location.file))
+          suite.location.file = mappedFile;
+      }
+    }
+  }
+  return suite;
+}
+function serializeLoadError(file, error) {
+  if (error instanceof Error) {
+    const result = (0, import_util2.filterStackTrace)(error);
+    const loc = error.loc;
+    result.location = loc ? {
+      file,
+      line: loc.line || 0,
+      column: loc.column || 0
+    } : void 0;
+    return result;
+  }
+  return { value: import_util.default.inspect(error) };
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  defaultTimeout,
+  loadTestFile
+});