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/mcp/proxyBackend.js

@@ -0,0 +1,123 @@
+"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 proxyBackend_exports = {};
+__export(proxyBackend_exports, {
+  ProxyBackend: () => ProxyBackend
+});
+module.exports = __toCommonJS(proxyBackend_exports);
+var import_utilsBundle = require("playwright-core/lib/utilsBundle");
+var mcpBundle = __toESM(require("./bundle"));
+const errorsDebug = (0, import_utilsBundle.debug)("pw:mcp:errors");
+class ProxyBackend {
+  constructor(name, version, mcpProviders) {
+    this._roots = [];
+    this.name = name;
+    this.version = version;
+    this._mcpProviders = mcpProviders;
+    this._contextSwitchTool = this._defineContextSwitchTool();
+  }
+  async initialize(clientVersion, roots) {
+    this._roots = roots;
+    await this._setCurrentClient(this._mcpProviders[0]);
+  }
+  async listTools() {
+    const response = await this._currentClient.listTools();
+    if (this._mcpProviders.length === 1)
+      return response.tools;
+    return [
+      ...response.tools,
+      this._contextSwitchTool
+    ];
+  }
+  async callTool(name, args) {
+    if (name === this._contextSwitchTool.name)
+      return this._callContextSwitchTool(args);
+    return await this._currentClient.callTool({
+      name,
+      arguments: args
+    });
+  }
+  serverClosed() {
+    void this._currentClient?.close().catch(errorsDebug);
+  }
+  async _callContextSwitchTool(params) {
+    try {
+      const factory = this._mcpProviders.find((factory2) => factory2.name === params.name);
+      if (!factory)
+        throw new Error("Unknown connection method: " + params.name);
+      await this._setCurrentClient(factory);
+      return {
+        content: [{ type: "text", text: "### Result\nSuccessfully changed connection method.\n" }]
+      };
+    } catch (error) {
+      return {
+        content: [{ type: "text", text: `### Result
+Error: ${error}
+` }],
+        isError: true
+      };
+    }
+  }
+  _defineContextSwitchTool() {
+    return {
+      name: "browser_connect",
+      description: [
+        "Connect to a browser using one of the available methods:",
+        ...this._mcpProviders.map((factory) => `- "${factory.name}": ${factory.description}`)
+      ].join("\n"),
+      inputSchema: mcpBundle.zodToJsonSchema(mcpBundle.z.object({
+        name: mcpBundle.z.enum(this._mcpProviders.map((factory) => factory.name)).default(this._mcpProviders[0].name).describe("The method to use to connect to the browser")
+      }), { strictUnions: true }),
+      annotations: {
+        title: "Connect to a browser context",
+        readOnlyHint: true,
+        openWorldHint: false
+      }
+    };
+  }
+  async _setCurrentClient(factory) {
+    await this._currentClient?.close();
+    this._currentClient = void 0;
+    const client = new mcpBundle.Client({ name: this.name, version: this.version });
+    client.registerCapabilities({
+      roots: {
+        listRoots: true
+      }
+    });
+    client.setRequestHandler(mcpBundle.ListRootsRequestSchema, () => ({ roots: this._roots }));
+    client.setRequestHandler(mcpBundle.PingRequestSchema, () => ({}));
+    const transport = await factory.connect();
+    await client.connect(transport);
+    this._currentClient = client;
+  }
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  ProxyBackend
+});