Feature/v2/file manager UI improvements (#4286)

# Description of Changes

<img width="1171" height="416" alt="Screenshot 2025-08-26 at 1 33 14 AM"
src="https://github.com/user-attachments/assets/7fd132fb-93ae-4849-b7b0-78182707cf14"
/>


---

## 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.

frontend/src/hooks/useRainbowTheme.ts

@@ -161,8 +161,8 @@ export function useRainbowTheme(initialTheme: 'light' | 'dark' = 'light'): Rainb
     }
     lastToggleTime.current = currentTime;
 
-    // Easter egg: Activate rainbow mode after 6 rapid toggles
-    if (toggleCount.current >= 6) {
+    // Easter egg: Activate rainbow mode after 10 rapid toggles
+    if (toggleCount.current >= 10) {
       setThemeMode('rainbow');
       console.log('🌈 RAINBOW MODE ACTIVATED! 🌈 You found the secret easter egg!');
       console.log('🌈 Button will be disabled for 3 seconds, then click once to exit!');