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/expectBundle.js

@@ -0,0 +1,49 @@
+"use strict";
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+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 __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
+var expectBundle_exports = {};
+__export(expectBundle_exports, {
+  EXPECTED_COLOR: () => EXPECTED_COLOR,
+  INVERTED_COLOR: () => INVERTED_COLOR,
+  RECEIVED_COLOR: () => RECEIVED_COLOR,
+  asymmetricMatchers: () => asymmetricMatchers,
+  expect: () => expect,
+  matcherUtils: () => matcherUtils,
+  mock: () => mock,
+  printReceived: () => printReceived
+});
+module.exports = __toCommonJS(expectBundle_exports);
+const expect = require("./expectBundleImpl").expect;
+const mock = require("./expectBundleImpl").mock;
+const asymmetricMatchers = require("./expectBundleImpl").asymmetricMatchers;
+const matcherUtils = require("./expectBundleImpl").matcherUtils;
+const EXPECTED_COLOR = require("./expectBundleImpl").EXPECTED_COLOR;
+const INVERTED_COLOR = require("./expectBundleImpl").INVERTED_COLOR;
+const RECEIVED_COLOR = require("./expectBundleImpl").RECEIVED_COLOR;
+const printReceived = require("./expectBundleImpl").printReceived;
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  EXPECTED_COLOR,
+  INVERTED_COLOR,
+  RECEIVED_COLOR,
+  asymmetricMatchers,
+  expect,
+  matcherUtils,
+  mock,
+  printReceived
+});