Feature/v2/all tools sidebar (#4151)

# Description of Changes

- Added the all tools sidebar
- Added a TextFit component that shrinks text to fit containers
- Added a TopToolIcon on the nav, that animates down to give users
feedback on what tool is selected
- Added the baseToolRegistry, to replace the old pattern of listing
tools, allowing us to clean up the ToolRegistry code
- Fixed Mantine light/dark theme race condition 
- General styling tweaks

---

## 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/components/tools/toolPicker/ToolButton.tsx

@@ -0,0 +1,50 @@
+import React from "react";
+import { Button } from "@mantine/core";
+import { Tooltip } from "../../shared/Tooltip";
+import { ToolRegistryEntry } from "../../../data/toolsTaxonomy";
+import FitText from "../../shared/FitText";
+
+interface ToolButtonProps {
+  id: string;
+  tool: ToolRegistryEntry;
+  isSelected: boolean;
+  onSelect: (id: string) => void;
+}
+
+const ToolButton: React.FC<ToolButtonProps> = ({ id, tool, isSelected, onSelect }) => {
+  const handleClick = (id: string) => {
+    if (tool.link) {
+      // Open external link in new tab 
+      window.open(tool.link, '_blank', 'noopener,noreferrer');
+      return; 
+    }
+    // Normal tool selection
+    onSelect(id);
+  };
+
+  return (
+    <Tooltip content={tool.description} position="right" arrow={true} delay={500}>
+      <Button
+        variant={isSelected ? "filled" : "subtle"}
+        onClick={()=> handleClick(id)}
+        size="md"
+        radius="md"
+        leftSection={<div className="tool-button-icon" style={{ color: "var(--tools-text-and-icon-color)" }}>{tool.icon}</div>}
+        fullWidth
+        justify="flex-start"
+        className="tool-button"
+        styles={{ root: { borderRadius: 0, color: "var(--tools-text-and-icon-color)" } }}
+      >
+        <FitText
+          text={tool.name}
+          lines={1}
+          minimumFontScale={0.8}
+          as="span"
+          style={{ display: 'inline-block', maxWidth: '100%' }}
+        />
+      </Button>
+    </Tooltip>
+  );
+};
+
+export default ToolButton;