Feature/v2/right rail (#4255)

# 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)
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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: ConnorYoh <[email protected]>
Co-authored-by: Anthony Stirling <[email protected]>

frontend/src/components/tools/ToolPicker.tsx

@@ -85,7 +85,8 @@ const ToolPicker = ({ selectedToolKey, onSelect, filteredTools, isSearching = fa
           overflowY: "auto",
           overflowX: "hidden",
           minHeight: 0,
-          height: "100%"
+          height: "100%",
+          marginTop: -2
         }}
         className="tool-picker-scrollable"
       >
@@ -109,7 +110,6 @@ const ToolPicker = ({ selectedToolKey, onSelect, filteredTools, isSearching = fa
                 zIndex: 2,
                 borderTop: `0.0625rem solid var(--tool-header-border)`,
                 borderBottom: `0.0625rem solid var(--tool-header-border)`,
-                marginBottom: -1,
                 padding: "0.5rem 1rem",
                 fontWeight: 700,
                 background: "var(--tool-header-bg)",
@@ -117,7 +117,7 @@ const ToolPicker = ({ selectedToolKey, onSelect, filteredTools, isSearching = fa
                 cursor: "pointer",
                 display: "flex",
                 alignItems: "center",
-                justifyContent: "space-between"
+                justifyContent: "space-between",
               }}
               onClick={() => scrollTo(quickAccessRef)}
             >