Add GA4 conversion tracking for subscription form

[Copilot]

Marketing teams cannot track newsletter signups as conversions because the AJAX subscription handler doesn't emit analytics events.

Changes

Settings

• Added enable_ga4_tracking checkbox in admin settings (Subscription Form section)
• Defaults to disabled; stored as 0/1 integer following plugin conventions

Frontend

• Pass setting to JavaScript via wp_localize_script
• Fire gtag('event', 'generate_lead', {...}) on successful subscription when enabled
• Strict boolean check (=== true) and existence verification for gtag
• Try-catch wrapper prevents errors if GA4/GTM fails

Example

// In public-script.js AJAX success handler
if (mskd_public.enable_ga4_tracking === true && typeof gtag !== 'undefined') {
    try {
        gtag('event', 'generate_lead', {
            'event_category': 'newsletter',
            'event_label': 'subscription_form'
        });
    } catch (error) {
        console.warn('MSKD: Failed to send GA4 event', error);
    }
}

Tests & Translations

• Added unit tests for setting defaults and state changes
• Updated Bulgarian and German translations

Warning

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add GA4 Conversion Tracking Option for Subscription Form</issue_title>
<issue_description># Add GA4 Conversion Tracking Option for Subscription Form

Description

Currently, the subscription form does not fire any Google Analytics 4 (GA4) or Google Tag Manager (GTM) events upon successful subscription.

Problem

Marketing teams cannot track successful newsletter signups as conversions in GA4 because the AJAX handler (public/js/public-script.js) only updates the UI text without emitting a data layer event.

Proposed Solution

Add a new setting in the plugin settings page (under the "Styling" or a new "Tracking" section):

• Enable GA4 Conversion Tracking

Implementation Details

1. Add a checkbox to the settings page in admin/partials/settings.php.
2. Pass this setting to the frontend via wp_localize_script in public/class-public.php.
3. In public/js/public-script.js, check if this setting is enabled.
4. If enabled, fire a gtag event on successful subscription:

   if (mskd_public.enable_tracking) {
       gtag('event', 'generate_lead', {
           'event_category': 'newsletter',
           'event_label': 'subscription_form'
       });
   }</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add GA4 Conversion Tracking Option for Subscription Form #92

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