3335 feature request add app version to posthog (#3348)

# Description of Changes

Please provide a summary of the changes, including:

Added app_version to all posthog captures

Closes #(3335)

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

src/main/java/stirling/software/SPDF/service/PostHogService.java

@@ -63,6 +63,8 @@ public class PostHogService {
         if (!applicationProperties.getSystem().isAnalyticsEnabled()) {
             return;
         }
+
+        properties.put("app_version", appVersion);
         postHog.capture(uniqueId, eventName, properties);
     }
 

src/main/resources/templates/fragments/common.html

@@ -84,13 +84,11 @@
 
     function UpdatePosthogConsent(){
       if(typeof(posthog) == "undefined") {
-        console.log("Posthog not initialised");
         return;
       }
 
       window.CookieConsent.acceptedCategory('analytics')?
         posthog.opt_in_capturing() : posthog.opt_out_capturing();
-      console.log("Posthog: Opted " + (posthog.has_opted_out_capturing()? "out" : "in"));
     }
     const stirlingPDFLabel = /*[[${@StirlingPDFLabel}]]*/ '';
     const analyticsEnabled = /*[[${@analyticsEnabled}]]*/ false;
@@ -150,8 +148,9 @@
       const baseUrl = window.location.hostname;
       posthog.register_once({
         'hostname': baseUrl,
-        'UUID': /*[[${@UUID}]]*/ ''
-      })
+        'UUID': /*[[${@UUID}]]*/ '',
+        'app_version': /*[[${@appVersion}]]*/ '',
+      });
     }
 
     window.addEventListener("cc:onConsent", UpdatePosthogConsent);