Set up comprehensive frontend testing infrastructure

- Install Jest for unit testing with React Testing Library
- Install Playwright for end-to-end testing
- Configure Jest with proper TypeScript support and module mapping
- Create test setup files and utilities for both unit and e2e tests

Components:
* Jest configuration with coverage thresholds
* Playwright configuration with browser automation
* Unit tests for LoginForm, AuthContext, and useSocketIO hook
* E2E tests for authentication, dashboard, and agents workflows
* GitHub Actions workflow for automated testing
* Mock data and API utilities for consistent testing
* Test documentation with best practices

Testing features:
- Unit tests with 70% coverage threshold
- E2E tests with API mocking and user journey testing
- CI/CD integration for automated test runs
- Cross-browser testing support with Playwright
- Authentication system testing end-to-end

🚀 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/node_modules/@testing-library/user-event/dist/cjs/utility/selectOptions.js

@@ -0,0 +1,114 @@
+'use strict';
+
+var dom = require('@testing-library/dom');
+var isElementType = require('../utils/misc/isElementType.js');
+require('../utils/dataTransfer/Clipboard.js');
+var isDisabled = require('../utils/misc/isDisabled.js');
+var wait = require('../utils/misc/wait.js');
+var cssPointerEvents = require('../utils/pointer/cssPointerEvents.js');
+require('../event/behavior/click.js');
+require('../event/behavior/cut.js');
+require('../event/behavior/keydown.js');
+require('../event/behavior/keypress.js');
+require('../event/behavior/keyup.js');
+require('../event/behavior/paste.js');
+var focus = require('../event/focus.js');
+
+async function selectOptions(select, values) {
+    return selectOptionsBase.call(this, true, select, values);
+}
+async function deselectOptions(select, values) {
+    return selectOptionsBase.call(this, false, select, values);
+}
+async function selectOptionsBase(newValue, select, values) {
+    if (!newValue && !select.multiple) {
+        throw dom.getConfig().getElementError(`Unable to deselect an option in a non-multiple select. Use selectOptions to change the selection instead.`, select);
+    }
+    const valArray = Array.isArray(values) ? values : [
+        values
+    ];
+    const allOptions = Array.from(select.querySelectorAll('option, [role="option"]'));
+    const selectedOptions = valArray.map((val)=>{
+        if (typeof val !== 'string' && allOptions.includes(val)) {
+            return val;
+        } else {
+            const matchingOption = allOptions.find((o)=>o.value === val || o.innerHTML === val);
+            if (matchingOption) {
+                return matchingOption;
+            } else {
+                throw dom.getConfig().getElementError(`Value "${String(val)}" not found in options`, select);
+            }
+        }
+    }).filter((option)=>!isDisabled.isDisabled(option));
+    if (isDisabled.isDisabled(select) || !selectedOptions.length) return;
+    const selectOption = (option)=>{
+        option.selected = newValue;
+        this.dispatchUIEvent(select, 'input', {
+            bubbles: true,
+            cancelable: false,
+            composed: true
+        });
+        this.dispatchUIEvent(select, 'change');
+    };
+    if (isElementType.isElementType(select, 'select')) {
+        if (select.multiple) {
+            for (const option of selectedOptions){
+                const withPointerEvents = this.config.pointerEventsCheck === 0 ? true : cssPointerEvents.hasPointerEvents(this, option);
+                // events fired for multiple select are weird. Can't use hover...
+                if (withPointerEvents) {
+                    this.dispatchUIEvent(option, 'pointerover');
+                    this.dispatchUIEvent(select, 'pointerenter');
+                    this.dispatchUIEvent(option, 'mouseover');
+                    this.dispatchUIEvent(select, 'mouseenter');
+                    this.dispatchUIEvent(option, 'pointermove');
+                    this.dispatchUIEvent(option, 'mousemove');
+                    this.dispatchUIEvent(option, 'pointerdown');
+                    this.dispatchUIEvent(option, 'mousedown');
+                }
+                focus.focusElement(select);
+                if (withPointerEvents) {
+                    this.dispatchUIEvent(option, 'pointerup');
+                    this.dispatchUIEvent(option, 'mouseup');
+                }
+                selectOption(option);
+                if (withPointerEvents) {
+                    this.dispatchUIEvent(option, 'click');
+                }
+                await wait.wait(this.config);
+            }
+        } else if (selectedOptions.length === 1) {
+            const withPointerEvents = this.config.pointerEventsCheck === 0 ? true : cssPointerEvents.hasPointerEvents(this, select);
+            // the click to open the select options
+            if (withPointerEvents) {
+                await this.click(select);
+            } else {
+                focus.focusElement(select);
+            }
+            selectOption(selectedOptions[0]);
+            if (withPointerEvents) {
+                // the browser triggers another click event on the select for the click on the option
+                // this second click has no 'down' phase
+                this.dispatchUIEvent(select, 'pointerover');
+                this.dispatchUIEvent(select, 'pointerenter');
+                this.dispatchUIEvent(select, 'mouseover');
+                this.dispatchUIEvent(select, 'mouseenter');
+                this.dispatchUIEvent(select, 'pointerup');
+                this.dispatchUIEvent(select, 'mouseup');
+                this.dispatchUIEvent(select, 'click');
+            }
+            await wait.wait(this.config);
+        } else {
+            throw dom.getConfig().getElementError(`Cannot select multiple options on a non-multiple select`, select);
+        }
+    } else if (select.getAttribute('role') === 'listbox') {
+        for (const option of selectedOptions){
+            await this.click(option);
+            await this.unhover(option);
+        }
+    } else {
+        throw dom.getConfig().getElementError(`Cannot select options on elements that are neither select nor listbox elements`, select);
+    }
+}
+
+exports.deselectOptions = deselectOptions;
+exports.selectOptions = selectOptions;