Feature/v2/compare tool (#4751)

# Description of Changes

- Addition of the compare 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)

### 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: James Brunton <[email protected]>

frontend/src/core/components/shared/AppConfigModal.tsx

@@ -1,12 +1,12 @@
 import React, { useMemo, useState, useEffect } from 'react';
 import { Modal, Text, ActionIcon, Tooltip } from '@mantine/core';
-import { useMediaQuery } from '@mantine/hooks';
 import { useNavigate, useLocation } from 'react-router-dom';
 import LocalIcon from '@app/components/shared/LocalIcon';
 import { createConfigNavSections } from '@app/components/shared/config/configNavSections';
 import { NavKey, VALID_NAV_KEYS } from '@app/components/shared/config/types';
 import { useAppConfig } from '@app/contexts/AppConfigContext';
 import '@app/components/shared/AppConfigModal.css';
+import { useIsMobile } from '@app/hooks/useIsMobile';
 import { Z_INDEX_OVER_FULLSCREEN_SURFACE, Z_INDEX_OVER_CONFIG_MODAL } from '@app/styles/zIndex';
 
 interface AppConfigModalProps {
@@ -15,10 +15,10 @@ interface AppConfigModalProps {
 }
 
 const AppConfigModal: React.FC<AppConfigModalProps> = ({ opened, onClose }) => {
+  const [active, setActive] = useState<NavKey>('general');
+  const isMobile = useIsMobile();
   const navigate = useNavigate();
   const location = useLocation();
-  const [active, setActive] = useState<NavKey>('general');
-  const isMobile = useMediaQuery("(max-width: 1024px)");
   const { config } = useAppConfig();
 
   // Extract section from URL path (e.g., /settings/people -> people)