Add comprehensive BDD/Gherkin support to HTML reporter plugin

- Implement BDD test detection based on .feature files and Gherkin syntax
- Add specialized BDD step formatting with proper keywords (Given, When, Then, And)
- Display feature information including name, description, and file path
- Add BDD-specific CSS styling with purple theme and visual indicators
- Include "Gherkin" badge and "Scenario:" prefix for BDD tests
- Add test type filter to distinguish BDD from regular tests
- Support BDD step timing, status indicators, and comments
- Maintain full compatibility with existing HTML reporter features
- Add comprehensive documentation for BDD support
- Include BDD test configuration and test cases

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

Author: Copilot

docs/plugins.md

@@ -722,6 +722,7 @@ Generates comprehensive HTML reports showing:
 
 - **Interactive Test Results**: Click-to-expand test details with comprehensive information
 - **Step-by-Step Details**: Shows individual test steps with proper method names (e.g., `I.seeFile()`, `I.amInPath()`), status indicators, and timing
+- **BDD/Gherkin Support**: Full support for Gherkin feature files with proper scenario formatting, step keywords, and feature information
 - **Test Statistics**: Visual cards displaying totals, passed, failed, and pending test counts with interactive pie chart
 - **Error Information**: Clean, formatted error messages for failed tests with ANSI color code stripping
 - **Artifacts Support**: Display screenshots and other test artifacts with modal viewing capability
@@ -732,7 +733,7 @@ Generates comprehensive HTML reports showing:
   - **Tags Support**: Display and filter by test tags (@smoke, @critical, etc.)
   - **Retry Tracking**: Shows retry attempts and final test status
   - **Test Notes**: Display test notes and comments
-  - **Interactive Filters**: Filter tests by status, feature, tags, and retry status
+  - **Interactive Filters**: Filter tests by status, feature, tags, retry status, and test type (BDD vs Regular)
   - **Test History**: Track test results across multiple runs with visual charts
   - **Stats Export**: Export test statistics in JSON format for integration with external tools (Grafana, etc.)
   - **Worker Support**: Compatible with run-workers and run-multiple commands
@@ -815,6 +816,69 @@ History tracking provides:
 - Visual charts in the HTML report
 - JSON data for external analysis
 
+### BDD/Gherkin Support
+
+The HTML reporter provides comprehensive support for BDD/Gherkin feature files with enhanced formatting and visualization:
+
+#### Key BDD Features
+
+- **Automatic Detection**: Automatically detects BDD/Gherkin tests based on `.feature` files and Gherkin syntax
+- **Scenario Formatting**: Displays scenarios with proper "Scenario:" prefix and visual distinction from regular tests
+- **Feature Information**: Shows complete feature details including name, description, and file path
+- **Gherkin Steps**: Displays steps with proper keywords (Given, When, Then, And) in a BDD-friendly format
+- **BDD Badge**: Visual indicator distinguishing Gherkin tests from regular CodeceptJS tests
+- **Feature Tags**: Supports both feature-level and scenario-level tags with proper inheritance
+- **Test Type Filtering**: Filter reports to show only BDD tests, only regular tests, or both
+
+#### BDD Configuration
+
+No special configuration required - BDD support is automatically enabled when using Gherkin feature files:
+
+```js
+// codecept.conf.js
+exports.config = {
+  gherkin: {
+    features: './features/*.feature',
+    steps: './step_definitions/*.js'
+  },
+  plugins: {
+    htmlReporter: {
+      enabled: true,
+      output: './output',
+      reportFileName: 'report.html'
+    }
+  }
+}
+```
+
+#### BDD Report Features
+
+**Feature Display:**
+- Feature name and description prominently displayed
+- Feature-level tags shown with purple styling
+- File path information for traceability
+- Language support for internationalized Gherkin
+
+**Scenario Formatting:**
+- Clear "Scenario:" prefix for test titles
+- "Feature:" prefix for feature grouping
+- Purple "Gherkin" badge for easy identification
+- Visual left border styling for BDD tests
+
+**Step Visualization:**
+- Proper Gherkin keywords: Given, When, Then, And
+- Step text displayed with original Gherkin formatting
+- Execution timing for each step
+- Status indicators (pass/fail) for individual steps
+- Support for data tables and docstrings in step comments
+
+**Enhanced Filtering:**
+- Test Type filter to show BDD-only or regular tests
+- All existing filters (tags, status, feature) work with BDD tests
+- Combined filtering for complex test selection
+
+The BDD support seamlessly integrates with all existing HTML reporter features including retry tracking, history, stats export, and artifact display.
+
 ### Parameters
 
 - `config`