Addition of the Show JavaScript tool (#4877)

# Description of Changes

- Added the show javascript tool.

---

## 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.

frontend/src/core/styles/theme.css

@@ -302,6 +302,11 @@
   --pdf-light-simulated-page-bg: 255 255 255;
   --pdf-light-simulated-page-text: 15 23 42;
 
+  /* Code token colors (light mode) */
+  --code-kw-color: #1d4ed8;   /* blue-700 */
+  --code-str-color: #16a34a;  /* green-600 */
+  --code-num-color: #4338ca;  /* indigo-700 */
+  --code-com-color: #6b7280;  /* gray-500 */
   /* Compare tool specific colors - only for colors that don't have existing theme pairs */
   --compare-upload-dropzone-bg: rgba(241, 245, 249, 0.45);
   --compare-upload-dropzone-border: rgba(148, 163, 184, 0.6);
@@ -534,6 +539,11 @@
   --modal-content-bg: #2A2F36;
   --modal-header-border: rgba(255, 255, 255, 0.08);
 
+  /* Code token colors (dark mode - Cursor-like) */
+  --code-kw-color: #C792EA;   /* purple */
+  --code-str-color: #C3E88D;  /* green */
+  --code-num-color: #F78C6C;  /* orange */
+  --code-com-color: #697098;  /* muted gray-blue */
   /* Compare tool specific colors (dark mode) - only for colors that don't have existing theme pairs */
   --compare-upload-dropzone-bg: rgba(31, 35, 41, 0.45);
   --compare-upload-dropzone-border: rgba(75, 85, 99, 0.6);