Feature/v2/selected pageeditor rework (#4756)

# Description of Changes

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Please provide a summary of the changes, including:

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

Closes #(issue_number)
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---

## 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.

---------

Co-authored-by: James Brunton <[email protected]>
Co-authored-by: Copilot <[email protected]>

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

@@ -1,6 +1,7 @@
 import React from 'react';
 import { ActionIcon, Tooltip } from '@mantine/core';
 import styles from '@app/components/shared/HoverActionMenu.module.css';
+import { Z_INDEX_HOVER_ACTION_MENU } from '@app/styles/zIndex';
 
 export interface HoverAction {
   id: string;
@@ -34,7 +35,7 @@ const HoverActionMenu: React.FC<HoverActionMenuProps> = ({
   return (
     <div
       className={`${styles.hoverMenu} ${position === 'outside' ? styles.outside : styles.inside} ${className}`}
-      style={{ opacity: show ? 1 : 0 }}
+      style={{ opacity: show ? 1 : 0, zIndex: Z_INDEX_HOVER_ACTION_MENU }}
       onMouseDown={(e) => e.stopPropagation()}
       onMouseUp={(e) => e.stopPropagation()}
       onClick={(e) => e.stopPropagation()}
@@ -44,10 +45,10 @@ const HoverActionMenu: React.FC<HoverActionMenuProps> = ({
           <ActionIcon
             size="md"
             variant="subtle"
-            style={{ color: action.color || 'var(--mantine-color-dimmed)' }}
             disabled={action.disabled}
             onClick={action.onClick}
             c={action.color}
+            style={{ color: action.color || 'var(--right-rail-icon)' }}
           >
             {action.icon}
           </ActionIcon>