feat(settings): display frontend/backend versions and warn on client-server mismatch (#5571)

# Description of Changes

## Summary
This PR improves the **Preferences → General → Software Updates**
section by:
- Showing **separate version labels** for **Frontend (Tauri client)**
and **Backend (server/AppConfig)** across all locales.
- Adding a **version mismatch detection** in `GeneralSection`, comparing
the Tauri app version against the backend `AppConfig` version and
displaying a **warning banner** when they differ.

## Why
Running a Tauri desktop client against a different backend version can
lead to:
- Compatibility issues (API/UI expectations drifting)
- Runtime errors due to schema/behavior changes
- Increased security risk if the client and server are not kept in sync

Surfacing both versions and warning on mismatch makes these situations
visible and easier to diagnose.


[stirling-pdf-2.4.1.exe.zip](https://github.com/user-attachments/files/24846696/stirling-pdf-2.4.1.exe.zip)

<img width="967" height="362" alt="image"
src="https://github.com/user-attachments/assets/8cd2a7d9-47ca-4caf-930b-4ec0a4c6317a"
/>


[stirling-pdf-2.4.0.exe.zip](https://github.com/user-attachments/files/24846864/stirling-pdf-2.4.0.exe.zip)

<img width="951" height="395" alt="image"
src="https://github.com/user-attachments/assets/70ba15eb-ec13-4737-9cae-1f6da3c18c1a"
/>

---

## 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.

.github/scripts/check_language_toml.py

@@ -59,8 +59,8 @@ def find_duplicate_keys(file_path, keys=None, prefix=""):
     return duplicates
 
 
-# Maximum size for TOML files (e.g., 570 KB)
-MAX_FILE_SIZE = 570 * 1024
+# Maximum size for TOML files (e.g., 1 MB)
+MAX_FILE_SIZE = 1000 * 1024
 
 
 def parse_toml_file(file_path):