feat: Introduce CodeceptJS WebElement Class to mirror chosen helpers' element instance (#5091)

* Initial plan

* Changes before error encountered

Co-authored-by: kobenguyent <[email protected]>

* Fix helper tests to expect WebElement instances instead of native elements

Co-authored-by: kobenguyent <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: kobenguyent <[email protected]>

Author: Copilot

docs/WebElement.md

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+# WebElement API
+
+The WebElement class provides a unified interface for interacting with elements across different CodeceptJS helpers (Playwright, WebDriver, Puppeteer). It wraps native element instances and provides consistent methods regardless of the underlying helper.
+
+## Basic Usage
+
+```javascript
+// Get WebElement instances from any helper
+const element = await I.grabWebElement('#button')
+const elements = await I.grabWebElements('.items')
+
+// Use consistent API across all helpers
+const text = await element.getText()
+const isVisible = await element.isVisible()
+await element.click()
+await element.type('Hello World')
+
+// Find child elements
+const childElement = await element.$('.child-selector')
+const childElements = await element.$$('.child-items')
+```
+
+## API Methods
+
+### Element Properties
+
+#### `getText()`
+
+Get the text content of the element.
+
+```javascript
+const text = await element.getText()
+console.log(text) // "Button Text"
+```
+
+#### `getAttribute(name)`
+
+Get the value of a specific attribute.
+
+```javascript
+const id = await element.getAttribute('id')
+const className = await element.getAttribute('class')
+```
+
+#### `getProperty(name)`
+
+Get the value of a JavaScript property.
+
+```javascript
+const value = await element.getProperty('value')
+const checked = await element.getProperty('checked')
+```
+
+#### `getInnerHTML()`
+
+Get the inner HTML content of the element.
+
+```javascript
+const html = await element.getInnerHTML()
+console.log(html) // "<span>Content</span>"
+```
+
+#### `getValue()`
+
+Get the value of input elements.
+
+```javascript
+const inputValue = await element.getValue()
+```
+
+### Element State
+
+#### `isVisible()`
+
+Check if the element is visible.
+
+```javascript
+const visible = await element.isVisible()
+if (visible) {
+  console.log('Element is visible')
+}
+```
+
+#### `isEnabled()`
+
+Check if the element is enabled (not disabled).
+
+```javascript
+const enabled = await element.isEnabled()
+if (enabled) {
+  await element.click()
+}
+```
+
+#### `exists()`
+
+Check if the element exists in the DOM.
+
+```javascript
+const exists = await element.exists()
+if (exists) {
+  console.log('Element exists')
+}
+```
+
+#### `getBoundingBox()`
+
+Get the element's bounding box (position and size).
+
+```javascript
+const box = await element.getBoundingBox()
+console.log(box) // { x: 100, y: 200, width: 150, height: 50 }
+```
+
+### Element Interactions
+
+#### `click(options)`
+
+Click the element.
+
+```javascript
+await element.click()
+// With options (Playwright/Puppeteer)
+await element.click({ button: 'right' })
+```
+
+#### `type(text, options)`
+
+Type text into the element.
+
+```javascript
+await element.type('Hello World')
+// With options (Playwright/Puppeteer)
+await element.type('Hello', { delay: 100 })
+```
+
+### Child Element Search
+
+#### `$(locator)`
+
+Find the first child element matching the locator.
+
+```javascript
+const childElement = await element.$('.child-class')
+if (childElement) {
+  await childElement.click()
+}
+```
+
+#### `$$(locator)`
+
+Find all child elements matching the locator.
+
+```javascript
+const childElements = await element.$$('.child-items')
+for (const child of childElements) {
+  const text = await child.getText()
+  console.log(text)
+}
+```
+
+### Native Access
+
+#### `getNativeElement()`
+
+Get the original native element instance.
+
+```javascript
+const nativeElement = element.getNativeElement()
+// For Playwright: ElementHandle
+// For WebDriver: WebElement
+// For Puppeteer: ElementHandle
+```
+
+#### `getHelper()`
+
+Get the helper instance that created this WebElement.
+
+```javascript
+const helper = element.getHelper()
+console.log(helper.constructor.name) // "Playwright", "WebDriver", or "Puppeteer"
+```
+
+## Locator Support
+
+The `$()` and `$$()` methods support various locator formats:
+
+```javascript
+// CSS selectors
+await element.$('.class-name')
+await element.$('#element-id')
+
+// CodeceptJS locator objects
+await element.$({ css: '.my-class' })
+await element.$({ xpath: '//div[@class="test"]' })
+await element.$({ id: 'element-id' })
+await element.$({ name: 'field-name' })
+await element.$({ className: 'my-class' })
+```
+
+## Cross-Helper Compatibility
+
+The same WebElement code works across all supported helpers:
+
+```javascript
+// This code works identically with Playwright, WebDriver, and Puppeteer
+const loginForm = await I.grabWebElement('#login-form')
+const usernameField = await loginForm.$('[name="username"]')
+const passwordField = await loginForm.$('[name="password"]')
+const submitButton = await loginForm.$('button[type="submit"]')
+
+await usernameField.type('[email protected]')
+await passwordField.type('password123')
+await submitButton.click()
+```
+
+## Migration from Native Elements
+
+If you were previously using native elements, you can gradually migrate:
+
+```javascript
+// Old way - helper-specific
+const nativeElements = await I.grabWebElements('.items')
+// Different API for each helper
+
+// New way - unified
+const webElements = await I.grabWebElements('.items')
+// Same API across all helpers
+
+// Backward compatibility
+const nativeElement = webElements[0].getNativeElement()
+// Use native methods if needed
+```
+
+## Error Handling
+
+WebElement methods will throw appropriate errors when operations fail:
+
+```javascript
+try {
+  const element = await I.grabWebElement('#nonexistent')
+} catch (error) {
+  console.log('Element not found')
+}
+
+try {
+  await element.click()
+} catch (error) {
+  console.log('Click failed:', error.message)
+}
+```