[Test PR] Desktop fix and unoconv to unoserver (#2971)

# Description of Changes

This pull request includes several updates to the Docker configuration
and Java application UI scaling. The changes enhance environment
variable management, dependency installation, and UI responsiveness to
different screen sizes.

### Docker Configuration Updates:
* Added new environment variables `STIRLING_PDF_DESKTOP_UI`,
`PYTHONPATH`, `UNO_PATH`, and `URE_BOOTSTRAP` to `Dockerfile` and
`Dockerfile.fat` to improve the configuration and integration of the
LibreOffice environment.
[[1]](diffhunk://#diff-dd2c0eb6ea5cfc6c4bd4eac30934e2d5746747af48fef6da689e85b752f39557L38-R46)
[[2]](diffhunk://#diff-571631582b988e88c52c86960cc083b0b8fa63cf88f056f26e9e684195221c27L40-R49)
* Updated the `CMD` instruction in `Dockerfile` and `Dockerfile.fat` to
run both the Java application and `unoserver` simultaneously.
[[1]](diffhunk://#diff-dd2c0eb6ea5cfc6c4bd4eac30934e2d5746747af48fef6da689e85b752f39557L87-R96)
[[2]](diffhunk://#diff-571631582b988e88c52c86960cc083b0b8fa63cf88f056f26e9e684195221c27L87-R100)
* Modified the `RUN` instruction to include additional Python
dependencies and setup a virtual environment.
[[1]](diffhunk://#diff-dd2c0eb6ea5cfc6c4bd4eac30934e2d5746747af48fef6da689e85b752f39557L68-R81)
[[2]](diffhunk://#diff-571631582b988e88c52c86960cc083b0b8fa63cf88f056f26e9e684195221c27R72-R86)

### Workflow Enhancements:
* Added `STIRLING_PDF_DESKTOP_UI` environment variable to the GitHub
Actions workflows (`PR-Demo-Comment.yml` and `push-docker.yml`) to
ensure consistent environment settings.
[[1]](diffhunk://#diff-145fe5c0ed8c24e4673c9ad39800dd171a2d0a2e8050497cff980fc7e3a3df0dR106)
[[2]](diffhunk://#diff-76056236de05155107f6a660f1e3956059e37338011b8f0e72188afcb9b17b6fR41)

### Java Application UI Scaling:
* Introduced `UIScaling` utility to dynamically adjust the size of UI
components based on screen resolution in `DesktopBrowser` and
`LoadingWindow` classes.
[[1]](diffhunk://#diff-dff83b0fe53cba8ee80dc8cee96b9c2bfec612ec1f2c636ebdf22dedb36671e8L218-R219)
[[2]](diffhunk://#diff-dff83b0fe53cba8ee80dc8cee96b9c2bfec612ec1f2c636ebdf22dedb36671e8L267-R270)
[[3]](diffhunk://#diff-3e287daf297213b698b3c94d6e6ed4aae139d570ba6b115da459d72b5c36c42fL44-R64)
[[4]](diffhunk://#diff-3e287daf297213b698b3c94d6e6ed4aae139d570ba6b115da459d72b5c36c42fL86-R102)
* Improved the loading of icons by using the `UIScaling` utility for
better visual quality.

---

## 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.

---------

Co-authored-by: pixeebot[bot] <104101892+pixeebot[bot]@users.noreply.github.com>
Co-authored-by: a <a>

testing/cucumber/features/external.feature

@@ -205,6 +205,7 @@ Feature: API Validation
   And the response file should have size greater than 100
   And the response file should have extension ".pdf"
   
+  @markdown @positive
   Scenario: Convert PDF to Markdown format
   Given I generate a PDF file as "fileInput"
   And the pdf contains 3 pages with random text
@@ -212,4 +213,18 @@ Feature: API Validation
   Then the response status code should be 200
   And the response file should have size greater than 100
   And the response file should have extension ".md"
+  
+ 
+  @positive @pdftocsv
+  Scenario: Convert PDF with tables to CSV format
+    Given I use an example file at "exampleFiles/tables.pdf" as parameter "fileInput"
+    And the request data includes
+      | parameter    | value       |
+      | outputFormat | csv         |
+      | pageNumbers  | all         |
+    When I send the API request to the endpoint "/api/v1/convert/pdf/csv"
+    Then the response status code should be 200
+    And the response file should have size greater than 200
+    And the response file should have extension ".zip"
+	And the response ZIP should contain 3 files
   

testing/test.sh

@@ -189,4 +189,4 @@ main() {
     fi
 }
 
-main
+main