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/matchers/toHaveURL.js

@@ -0,0 +1,117 @@
+"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 toHaveURL_exports = {};
+__export(toHaveURL_exports, {
+  toHaveURLWithPredicate: () => toHaveURLWithPredicate
+});
+module.exports = __toCommonJS(toHaveURL_exports);
+var import_utils = require("playwright-core/lib/utils");
+var import_utils2 = require("playwright-core/lib/utils");
+var import_expect = require("./expect");
+var import_matcherHint = require("./matcherHint");
+var import_expectBundle = require("../common/expectBundle");
+async function toHaveURLWithPredicate(page, expected, options) {
+  const matcherName = "toHaveURL";
+  const expression = "page";
+  const matcherOptions = {
+    isNot: this.isNot,
+    promise: this.promise
+  };
+  if (typeof expected !== "function") {
+    throw new Error(
+      [
+        // Always display `expected` in expectation place
+        (0, import_matcherHint.matcherHint)(this, void 0, matcherName, expression, void 0, matcherOptions, void 0, void 0, true),
+        `${import_utils2.colors.bold("Matcher error")}: ${(0, import_expectBundle.EXPECTED_COLOR)("expected")} value must be a string, regular expression, or predicate`,
+        this.utils.printWithType("Expected", expected, this.utils.printExpected)
+      ].join("\n\n")
+    );
+  }
+  const timeout = options?.timeout ?? this.timeout;
+  const baseURL = page.context()._options.baseURL;
+  let conditionSucceeded = false;
+  let lastCheckedURLString = void 0;
+  try {
+    await page.mainFrame().waitForURL(
+      (url) => {
+        lastCheckedURLString = url.toString();
+        if (options?.ignoreCase) {
+          return !this.isNot === (0, import_utils.urlMatches)(
+            baseURL?.toLocaleLowerCase(),
+            lastCheckedURLString.toLocaleLowerCase(),
+            expected
+          );
+        }
+        return !this.isNot === (0, import_utils.urlMatches)(baseURL, lastCheckedURLString, expected);
+      },
+      { timeout }
+    );
+    conditionSucceeded = true;
+  } catch (e) {
+    conditionSucceeded = false;
+  }
+  if (conditionSucceeded)
+    return { name: matcherName, pass: !this.isNot, message: () => "" };
+  return {
+    name: matcherName,
+    pass: this.isNot,
+    message: () => toHaveURLMessage(
+      this,
+      matcherName,
+      expression,
+      expected,
+      lastCheckedURLString,
+      this.isNot,
+      true,
+      timeout
+    ),
+    actual: lastCheckedURLString,
+    timeout
+  };
+}
+function toHaveURLMessage(state, matcherName, expression, expected, received, pass, didTimeout, timeout) {
+  const matcherOptions = {
+    isNot: state.isNot,
+    promise: state.promise
+  };
+  const receivedString = received || "";
+  const messagePrefix = (0, import_matcherHint.matcherHint)(state, void 0, matcherName, expression, void 0, matcherOptions, didTimeout ? timeout : void 0, void 0, true);
+  let printedReceived;
+  let printedExpected;
+  let printedDiff;
+  if (typeof expected === "function") {
+    printedExpected = `Expected predicate to ${!state.isNot ? "succeed" : "fail"}`;
+    printedReceived = `Received string: ${(0, import_expectBundle.printReceived)(receivedString)}`;
+  } else {
+    if (pass) {
+      printedExpected = `Expected pattern: not ${state.utils.printExpected(expected)}`;
+      const formattedReceived = (0, import_expect.printReceivedStringContainExpectedResult)(receivedString, null);
+      printedReceived = `Received string: ${formattedReceived}`;
+    } else {
+      const labelExpected = `Expected ${typeof expected === "string" ? "string" : "pattern"}`;
+      printedDiff = state.utils.printDiffOrStringify(expected, receivedString, labelExpected, "Received string", false);
+    }
+  }
+  const resultDetails = printedDiff ? printedDiff : printedExpected + "\n" + printedReceived;
+  return messagePrefix + resultDetails;
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  toHaveURLWithPredicate
+});