Stirling 2.0 (#3928)

# Description of Changes

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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

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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: Anthony Stirling <[email protected]>

frontend/src/hooks/tools/shared/useOperationResults.ts

@@ -0,0 +1,67 @@
+import { useState, useCallback } from 'react';
+
+export interface OperationResult {
+  files: File[];
+  thumbnails: string[];
+  isGeneratingThumbnails: boolean;
+}
+
+export interface OperationResultsHook {
+  results: OperationResult;
+  downloadUrl: string | null;
+  status: string;
+  errorMessage: string | null;
+  isLoading: boolean;
+  
+  setResults: (results: OperationResult) => void;
+  setDownloadUrl: (url: string | null) => void;
+  setStatus: (status: string) => void;
+  setErrorMessage: (error: string | null) => void;
+  setIsLoading: (loading: boolean) => void;
+  
+  resetResults: () => void;
+  clearError: () => void;
+}
+
+const initialResults: OperationResult = {
+  files: [],
+  thumbnails: [],
+  isGeneratingThumbnails: false,
+};
+
+export const useOperationResults = (): OperationResultsHook => {
+  const [results, setResults] = useState<OperationResult>(initialResults);
+  const [downloadUrl, setDownloadUrl] = useState<string | null>(null);
+  const [status, setStatus] = useState('');
+  const [errorMessage, setErrorMessage] = useState<string | null>(null);
+  const [isLoading, setIsLoading] = useState(false);
+
+  const resetResults = useCallback(() => {
+    setResults(initialResults);
+    setDownloadUrl(null);
+    setStatus('');
+    setErrorMessage(null);
+    setIsLoading(false);
+  }, []);
+
+  const clearError = useCallback(() => {
+    setErrorMessage(null);
+  }, []);
+
+  return {
+    results,
+    downloadUrl,
+    status,
+    errorMessage,
+    isLoading,
+    
+    setResults,
+    setDownloadUrl,
+    setStatus,
+    setErrorMessage,
+    setIsLoading,
+    
+    resetResults,
+    clearError,
+  };
+};