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/process.js

@@ -0,0 +1,104 @@
+"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 process_exports = {};
+__export(process_exports, {
+  ProcessRunner: () => ProcessRunner
+});
+module.exports = __toCommonJS(process_exports);
+var import_utils = require("playwright-core/lib/utils");
+var import_util = require("../util");
+class ProcessRunner {
+  async gracefullyClose() {
+  }
+  dispatchEvent(method, params) {
+    const response = { method, params };
+    sendMessageToParent({ method: "__dispatch__", params: response });
+  }
+}
+let gracefullyCloseCalled = false;
+let forceExitInitiated = false;
+sendMessageToParent({ method: "ready" });
+process.on("disconnect", () => gracefullyCloseAndExit(true));
+process.on("SIGINT", () => {
+});
+process.on("SIGTERM", () => {
+});
+let processRunner;
+let processName;
+const startingEnv = { ...process.env };
+process.on("message", async (message) => {
+  if (message.method === "__init__") {
+    const { processParams, runnerParams, runnerScript } = message.params;
+    void (0, import_utils.startProfiling)();
+    (0, import_utils.setTimeOrigin)(processParams.timeOrigin);
+    const { create } = require(runnerScript);
+    processRunner = create(runnerParams);
+    processName = processParams.processName;
+    return;
+  }
+  if (message.method === "__stop__") {
+    const keys = /* @__PURE__ */ new Set([...Object.keys(process.env), ...Object.keys(startingEnv)]);
+    const producedEnv = [...keys].filter((key) => startingEnv[key] !== process.env[key]).map((key) => [key, process.env[key] ?? null]);
+    sendMessageToParent({ method: "__env_produced__", params: producedEnv });
+    await gracefullyCloseAndExit(false);
+    return;
+  }
+  if (message.method === "__dispatch__") {
+    const { id, method, params } = message.params;
+    try {
+      const result = await processRunner[method](params);
+      const response = { id, result };
+      sendMessageToParent({ method: "__dispatch__", params: response });
+    } catch (e) {
+      const response = { id, error: (0, import_util.serializeError)(e) };
+      sendMessageToParent({ method: "__dispatch__", params: response });
+    }
+  }
+});
+const kForceExitTimeout = +(process.env.PWTEST_FORCE_EXIT_TIMEOUT || 3e4);
+async function gracefullyCloseAndExit(forceExit) {
+  if (forceExit && !forceExitInitiated) {
+    forceExitInitiated = true;
+    setTimeout(() => process.exit(0), kForceExitTimeout);
+  }
+  if (!gracefullyCloseCalled) {
+    gracefullyCloseCalled = true;
+    await processRunner?.gracefullyClose().catch(() => {
+    });
+    if (processName)
+      await (0, import_utils.stopProfiling)(processName).catch(() => {
+      });
+    process.exit(0);
+  }
+}
+function sendMessageToParent(message) {
+  try {
+    process.send(message);
+  } catch (e) {
+    try {
+      JSON.stringify(message);
+    } catch {
+      throw e;
+    }
+  }
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  ProcessRunner
+});