removal of old java desktop + workspace change in tauri (#5459)

# Description of Changes

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Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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---

## 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/devGuide/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/devGuide/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/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### 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/devGuide/DeveloperGuide.md#6-testing)
for more details.

app/core/build.gradle

@@ -38,13 +38,6 @@ spotless {
 }
 
 dependencies {
-    if (System.getenv('STIRLING_PDF_DESKTOP_UI') != 'false'
-        || (project.hasProperty('STIRLING_PDF_DESKTOP_UI')
-        && project.getProperty('STIRLING_PDF_DESKTOP_UI') != 'false')) {
-        implementation 'org.openjfx:javafx-controls:21'
-        implementation 'org.openjfx:javafx-swing:21'
-    }
-
     if (System.getenv('DISABLE_ADDITIONAL_FEATURES') != 'true'
         || (project.hasProperty('DISABLE_ADDITIONAL_FEATURES')
         && System.getProperty('DISABLE_ADDITIONAL_FEATURES') != 'true')) {
@@ -115,19 +108,8 @@ sourceSets {
         resources {
             srcDirs += ['../configs']
         }
-        java {
-            if (System.getenv('STIRLING_PDF_DESKTOP_UI') == 'false') {
-                exclude 'stirling/software/SPDF/UI/impl/**'
-            }
-
-        }
     }
     test {
-        java {
-            if (System.getenv('STIRLING_PDF_DESKTOP_UI') == 'false') {
-                exclude 'stirling/software/SPDF/UI/impl/**'
-            }
-        }
     }
 
 }