feat(frontend): enhance icon detection and update config navigation icon (#5524)

# Description of Changes

### What was changed
- Extended the `generate-icons.js` script to detect additional icon
usage patterns:
  - `<LocalIcon icon='...' />` with single-quoted icon names
- Icon definitions inside configuration objects (`icon: '...'` or `icon:
"..."`)
- Updated the configuration navigation icon for the *Connection Mode*
section from `cloud-rounded` to `desktop-cloud-rounded` in both
hook-based and static section definitions.

### Why the change was made
- The icon generation script previously missed icons referenced via
`LocalIcon` with single quotes and icons defined in config objects,
which could lead to missing assets in builds.
- The navigation icon update aligns the UI with the intended
desktop-specific icon semantics.


---

## 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.

---------

Co-authored-by: Copilot <[email protected]>

frontend/src/desktop/components/shared/config/configNavSections.tsx

@@ -23,7 +23,7 @@ export const useConfigNavSections = (
       {
         key: 'connectionMode',
         label: t('settings.connection.title', 'Connection Mode'),
-        icon: 'cloud-rounded',
+        icon: 'desktop-cloud-rounded',
         component: <ConnectionSettings />,
       },
     ],
@@ -53,7 +53,7 @@ export const createConfigNavSections = (
       {
         key: 'connectionMode',
         label: 'Connection Mode',
-        icon: 'cloud-rounded',
+        icon: 'desktop-cloud-rounded',
         component: <ConnectionSettings />,
       },
     ],