Tools/ocr/v2 (#4055)

# Description of Changes

- Added the OCR tool 
- Added language mappings file to map selected browser language -> OCR
language and OCR language codes -> english display values. TODO: Use the
translation function to translate the languages rather than mapping them
to english be default
- Added chevron icons to tool step to show expand and collapsed state
more visibly
- Added a re-usable dropdown picker with a footer component

---

## 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)

### 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.

---------

Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>

frontend/src/theme/mantineTheme.ts

@@ -167,6 +167,39 @@ export const mantineTheme = createTheme({
       },
     },
 
+    MultiSelect: {
+      styles: {
+        input: {
+          backgroundColor: 'var(--bg-surface)',
+          borderColor: 'var(--border-default)',
+          color: 'var(--text-primary)',
+          '&:focus': {
+            borderColor: 'var(--color-primary-500)',
+            boxShadow: '0 0 0 1px var(--color-primary-500)',
+          },
+        },
+        label: {
+          color: 'var(--text-secondary)',
+          fontWeight: 'var(--font-weight-medium)',
+        },
+        dropdown: {
+          backgroundColor: 'var(--bg-surface)',
+          borderColor: 'var(--border-subtle)',
+          boxShadow: 'var(--shadow-lg)',
+        },
+        option: {
+          color: 'var(--text-primary)',
+          '&[data-hovered]': {
+            backgroundColor: 'var(--hover-bg)',
+          },
+          '&[data-selected]': {
+            backgroundColor: 'var(--color-primary-100)',
+            color: 'var(--color-primary-900)',
+          },
+        },
+      },
+    },
+
     Checkbox: {
       styles: {
         input: {