dropdown fixes (#3879)

# Description of Changes

Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)

---

## 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/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/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/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/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

stirling-pdf/src/main/resources/static/css/navbar.css

@@ -384,19 +384,7 @@ html[dir="rtl"] .dropdown-menu {
   right: auto;
 }
 
-html[dir="ltr"] .dropdown-menu[data-bs-popper] {
-  top: auto;
-  left: auto;
-  right: 0;
-  margin-top: 0 !important;
-}
-
-html[dir="rtl"] .dropdown-menu[data-bs-popper] {
-  top: auto;
-  left: 0;
-  right: auto;
-  margin-top: 0 !important;
-}
+/* Bootstrap Popper positioning overrides removed - dropdowns now position naturally relative to their buttons */
 
 .dropdown-menu-wrapper {
   padding: 1.5rem 0;

stirling-pdf/src/main/resources/templates/fragments/common.html

@@ -85,7 +85,16 @@
         const dropdowns = document.querySelectorAll('.dropdown-menu');
         dropdowns.forEach(dropdown => {
           dropdown.style.transform = `scale(${dropdownScale})`;
-          dropdown.style.transformOrigin = 'top center';
+          
+          // Use different transform origins based on dropdown position
+          const parentItem = dropdown.closest('.nav-item');
+          const navbar = dropdown.closest('.navbar-nav');
+          
+          // Check if this is a right-aligned dropdown (language, favorites, search, etc.)
+          const isRightAligned = navbar && navbar.classList.contains('flex-nowrap') && 
+                                !parentItem?.closest('.dropdown-mega');
+          
+          dropdown.style.transformOrigin = isRightAligned ? 'top right' : 'top left';
         });
         
         console.log('Applied dropdown scale:', dropdownScale);