Stirling 2.0 (#3928)

# Description of Changes

<!--

File context for managing files between tools and views
Optimisation for large files
Updated Split to work with new file system and match Matts stepped
design closer

-->

---

## 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: Anthony Stirling <[email protected]>

frontend/src/components/tools/shared/FileStatusIndicator.tsx

@@ -0,0 +1,40 @@
+import React from 'react';
+import { Text } from '@mantine/core';
+
+export interface FileStatusIndicatorProps {
+  selectedFiles?: File[];
+  isCompleted?: boolean;
+  placeholder?: string;
+  showFileName?: boolean;
+}
+
+const FileStatusIndicator = ({
+  selectedFiles = [],
+  isCompleted = false,
+  placeholder = "Select a PDF file in the main view to get started",
+  showFileName = true
+}: FileStatusIndicatorProps) => {
+  if (selectedFiles.length === 0) {
+    return (
+      <Text size="sm" c="dimmed">
+        {placeholder}
+      </Text>
+    );
+  }
+
+  if (isCompleted) {
+    return (
+      <Text size="sm" c="green">
+        ✓ Selected: {showFileName ? selectedFiles[0]?.name : `${selectedFiles.length} file${selectedFiles.length > 1 ? 's' : ''}`}
+      </Text>
+    );
+  }
+
+  return (
+    <Text size="sm" c="blue">
+      Selected: {showFileName ? selectedFiles[0]?.name : `${selectedFiles.length} file${selectedFiles.length > 1 ? 's' : ''}`}
+    </Text>
+  );
+}
+
+export default FileStatusIndicator;