[V2] fix(tooltip): adjust close button position (#4803)

# Description of Changes

- Updated the `top` property of `.tooltip-pin-button` from `-0.5rem` to
`0.5rem` for proper alignment.

### Pictures:

Before:
<img width="903" height="838" alt="image"
src="https://github.com/user-attachments/assets/df2dfab0-9a5d-4d45-9b7b-16a30124af87"
/>
After:
<img width="903" height="838" alt="image"
src="https://github.com/user-attachments/assets/d88f3fad-b281-4dfa-96e1-e56e2639aaf5"
/>
Before:
<img width="903" height="838" alt="image"
src="https://github.com/user-attachments/assets/6406b9f4-8d03-4703-b680-9f70007ecced"
/>
After:
<img width="903" height="838" alt="image"
src="https://github.com/user-attachments/assets/7c548149-ab5d-4364-bee7-9acd55662216"
/>



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## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] 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)
- [x] I have performed a self-review of my own code
- [x] 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)

- [x] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [x] 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/core/components/shared/tooltip/Tooltip.module.css

@@ -33,7 +33,7 @@
 /* Close button */
 .tooltip-pin-button {
   position: absolute;
-  top: -0.5rem;
+  top: 0.5rem;
   right: 0.5rem;
   font-size: 0.875rem;
   background: var(--bg-raised);