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/third_party/pirates.js

@@ -0,0 +1,62 @@
+"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 pirates_exports = {};
+__export(pirates_exports, {
+  addHook: () => addHook
+});
+module.exports = __toCommonJS(pirates_exports);
+var import_module = __toESM(require("module"));
+var import_path = __toESM(require("path"));
+function addHook(transformHook, shouldTransform, extensions) {
+  const extensionsToOverwrite = extensions.filter((e) => e !== ".cjs");
+  const allSupportedExtensions = new Set(extensions);
+  const loaders = import_module.default._extensions;
+  const jsLoader = loaders[".js"];
+  for (const extension of extensionsToOverwrite) {
+    let newLoader2 = function(mod, filename, ...loaderArgs) {
+      if (allSupportedExtensions.has(import_path.default.extname(filename)) && shouldTransform(filename)) {
+        let newCompile2 = function(code, file, ...ignoredArgs) {
+          mod._compile = oldCompile;
+          return oldCompile.call(this, transformHook(code, filename), file);
+        };
+        var newCompile = newCompile2;
+        const oldCompile = mod._compile;
+        mod._compile = newCompile2;
+      }
+      originalLoader.call(this, mod, filename, ...loaderArgs);
+    };
+    var newLoader = newLoader2;
+    const originalLoader = loaders[extension] || jsLoader;
+    loaders[extension] = newLoader2;
+  }
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  addHook
+});

frontend/e2e/node_modules/playwright/lib/third_party/tsconfig-loader.js

@@ -0,0 +1,103 @@
+"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 tsconfig_loader_exports = {};
+__export(tsconfig_loader_exports, {
+  loadTsConfig: () => loadTsConfig
+});
+module.exports = __toCommonJS(tsconfig_loader_exports);
+var import_path = __toESM(require("path"));
+var import_fs = __toESM(require("fs"));
+var import_utilsBundle = require("../utilsBundle");
+function loadTsConfig(configPath) {
+  try {
+    const references = [];
+    const config = innerLoadTsConfig(configPath, references);
+    return [config, ...references];
+  } catch (e) {
+    throw new Error(`Failed to load tsconfig file at ${configPath}:
+${e.message}`);
+  }
+}
+function resolveConfigFile(baseConfigFile, referencedConfigFile) {
+  if (!referencedConfigFile.endsWith(".json"))
+    referencedConfigFile += ".json";
+  const currentDir = import_path.default.dirname(baseConfigFile);
+  let resolvedConfigFile = import_path.default.resolve(currentDir, referencedConfigFile);
+  if (referencedConfigFile.includes("/") && referencedConfigFile.includes(".") && !import_fs.default.existsSync(resolvedConfigFile))
+    resolvedConfigFile = import_path.default.join(currentDir, "node_modules", referencedConfigFile);
+  return resolvedConfigFile;
+}
+function innerLoadTsConfig(configFilePath, references, visited = /* @__PURE__ */ new Map()) {
+  if (visited.has(configFilePath))
+    return visited.get(configFilePath);
+  let result = {
+    tsConfigPath: configFilePath
+  };
+  visited.set(configFilePath, result);
+  if (!import_fs.default.existsSync(configFilePath))
+    return result;
+  const configString = import_fs.default.readFileSync(configFilePath, "utf-8");
+  const cleanedJson = StripBom(configString);
+  const parsedConfig = import_utilsBundle.json5.parse(cleanedJson);
+  const extendsArray = Array.isArray(parsedConfig.extends) ? parsedConfig.extends : parsedConfig.extends ? [parsedConfig.extends] : [];
+  for (const extendedConfig of extendsArray) {
+    const extendedConfigPath = resolveConfigFile(configFilePath, extendedConfig);
+    const base = innerLoadTsConfig(extendedConfigPath, references, visited);
+    Object.assign(result, base, { tsConfigPath: configFilePath });
+  }
+  if (parsedConfig.compilerOptions?.allowJs !== void 0)
+    result.allowJs = parsedConfig.compilerOptions.allowJs;
+  if (parsedConfig.compilerOptions?.paths !== void 0) {
+    result.paths = {
+      mapping: parsedConfig.compilerOptions.paths,
+      pathsBasePath: import_path.default.dirname(configFilePath)
+    };
+  }
+  if (parsedConfig.compilerOptions?.baseUrl !== void 0) {
+    result.absoluteBaseUrl = import_path.default.resolve(import_path.default.dirname(configFilePath), parsedConfig.compilerOptions.baseUrl);
+  }
+  for (const ref of parsedConfig.references || [])
+    references.push(innerLoadTsConfig(resolveConfigFile(configFilePath, ref.path), references, visited));
+  if (import_path.default.basename(configFilePath) === "jsconfig.json" && result.allowJs === void 0)
+    result.allowJs = true;
+  return result;
+}
+function StripBom(string) {
+  if (typeof string !== "string") {
+    throw new TypeError(`Expected a string, got ${typeof string}`);
+  }
+  if (string.charCodeAt(0) === 65279) {
+    return string.slice(1);
+  }
+  return string;
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  loadTsConfig
+});