Remove "Download for Desktop" and "Security Check" slides from desktop app onboarding (#5012)

# Description of Changes

- Title^ + I changed the text for set as default to make it more visible

---

## 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: Anthony Stirling <[email protected]>
Co-authored-by: Connor Yoh <[email protected]>

frontend/src/core/components/onboarding/ServerLicenseModal.tsx

@@ -71,8 +71,10 @@ export default function ServerLicenseModal({
             slideKey={slide.key}
           />
           <div className={styles.heroLogo}>
-            <div className={styles.heroLogoCircle}>
-              <img src={`${BASE_PATH}/branding/StirlingPDFLogoNoTextLightHC.svg`} alt="Stirling logo" />
+            <div className={styles.heroIconsContainer}>
+              <div className={styles.iconWrapper}>
+                <img src={`${BASE_PATH}/modern-logo/logo512.png`} alt="Stirling icon" className={styles.downloadIcon} />
+              </div>
             </div>
           </div>
         </div>

frontend/src/core/components/onboarding/onboardingFlowConfig.ts

@@ -175,7 +175,7 @@ export const SLIDE_DEFINITIONS: Record<SlideId, SlideDefinition> = {
   'server-license': {
     id: 'server-license',
     createSlide: ({ licenseNotice }) => ServerLicenseSlide({ licenseNotice }),
-    hero: { type: 'logo' },
+    hero: { type: 'dual-icon' },
     buttons: [
       {
         key: 'license-close',

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

@@ -130,6 +130,11 @@ export const InfoBanner: React.FC<InfoBannerProps> = ({
               onClick={onButtonClick}
               loading={loading}
               leftSection={<LocalIcon icon={buttonIcon} width="0.9rem" height="0.9rem" />}
+              styles={{
+                label: {
+                  color: textColor ?? toneStyle.text,
+                },
+              }}
             >
               {buttonText}
             </Button>