Feature/v2/file handling improvements (#4222)

# Description of Changes

A new universal file context rather than the splintered ones for the
main views, tools and manager we had before (manager still has its own
but its better integreated with the core context)
File context has been split it into a handful of different files
managing various file related issues separately to reduce the monolith -
FileReducer.ts - State management
  fileActions.ts - File operations
  fileSelectors.ts - Data access patterns
  lifecycle.ts - Resource cleanup and memory management
  fileHooks.ts - React hooks interface
  contexts.ts - Context providers
Improved thumbnail generation
Improved indexxedb handling
Stopped handling files as blobs were not necessary to improve
performance
A new library handling drag and drop
https://github.com/atlassian/pragmatic-drag-and-drop (Out of scope yes
but I broke the old one with the new filecontext and it needed doing so
it was a might as well)
A new library handling virtualisation on page editor
@tanstack/react-virtual, as above.
Quickly ripped out the last remnants of the old URL params stuff and
replaced with the beginnings of what will later become the new URL
navigation system (for now it just restores the tool name in url
behavior)
Fixed selected file not regestered when opening a tool
Fixed png thumbnails
Closes #(issue_number)

---

## 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: Reece Browne <[email protected]>

frontend/src/components/FileManager.tsx

@@ -1,9 +1,10 @@
 import React, { useState, useCallback, useEffect } from 'react';
 import { Modal } from '@mantine/core';
 import { Dropzone } from '@mantine/dropzone';
-import { FileWithUrl } from '../types/file';
+import { FileMetadata } from '../types/file';
 import { useFileManager } from '../hooks/useFileManager';
 import { useFilesModalContext } from '../contexts/FilesModalContext';
+import { createFileId } from '../types/fileContext';
 import { Tool } from '../types/tool';
 import MobileLayout from './fileManager/MobileLayout';
 import DesktopLayout from './fileManager/DesktopLayout';
@@ -15,13 +16,19 @@ interface FileManagerProps {
 }
 
 const FileManager: React.FC<FileManagerProps> = ({ selectedTool }) => {
-  const { isFilesModalOpen, closeFilesModal, onFilesSelect } = useFilesModalContext();
-  const [recentFiles, setRecentFiles] = useState<FileWithUrl[]>([]);
+  const { isFilesModalOpen, closeFilesModal, onFilesSelect, onStoredFilesSelect } = useFilesModalContext();
+  const [recentFiles, setRecentFiles] = useState<FileMetadata[]>([]);
   const [isDragging, setIsDragging] = useState(false);
   const [isMobile, setIsMobile] = useState(false);
 
   const { loadRecentFiles, handleRemoveFile, storeFile, convertToFile } = useFileManager();
 
+  // Wrapper for storeFile that generates UUID
+  const storeFileWithId = useCallback(async (file: File) => {
+    const fileId = createFileId(); // Generate UUID for storage
+    return await storeFile(file, fileId);
+  }, [storeFile]);
+
   // File management handlers
   const isFileSupported = useCallback((fileName: string) => {
     if (!selectedTool?.supportedFormats) return true;
@@ -34,18 +41,21 @@ const FileManager: React.FC<FileManagerProps> = ({ selectedTool }) => {
     setRecentFiles(files);
   }, [loadRecentFiles]);
 
-  const handleFilesSelected = useCallback(async (files: FileWithUrl[]) => {
+  const handleFilesSelected = useCallback(async (files: FileMetadata[]) => {
     try {
-      const fileObjects = await Promise.all(
-        files.map(async (fileWithUrl) => {
-          return await convertToFile(fileWithUrl);
-        })
+      // Use stored files flow that preserves original IDs
+      const filesWithMetadata = await Promise.all(
+        files.map(async (metadata) => ({
+          file: await convertToFile(metadata),
+          originalId: metadata.id,
+          metadata
+        }))
       );
-      onFilesSelect(fileObjects);
+      onStoredFilesSelect(filesWithMetadata);
     } catch (error) {
       console.error('Failed to process selected files:', error);
     }
-  }, [convertToFile, onFilesSelect]);
+  }, [convertToFile, onStoredFilesSelect]);
 
   const handleNewFileUpload = useCallback(async (files: File[]) => {
     if (files.length > 0) {
@@ -82,14 +92,11 @@ const FileManager: React.FC<FileManagerProps> = ({ selectedTool }) => {
   // Cleanup any blob URLs when component unmounts
   useEffect(() => {
     return () => {
-      // Clean up blob URLs from recent files
-      recentFiles.forEach(file => {
-        if (file.url && file.url.startsWith('blob:')) {
-          URL.revokeObjectURL(file.url);
-        }
-      });
+      // FileMetadata doesn't have blob URLs, so no cleanup needed
+      // Blob URLs are managed by FileContext and tool operations
+      console.log('FileManager unmounting - FileContext handles blob URL cleanup');
     };
-  }, [recentFiles]);
+  }, []);
 
   // Modal size constants for consistent scaling
   const modalHeight = '80vh';
@@ -130,7 +137,7 @@ const FileManager: React.FC<FileManagerProps> = ({ selectedTool }) => {
           onDrop={handleNewFileUpload}
           onDragEnter={() => setIsDragging(true)}
           onDragLeave={() => setIsDragging(false)}
-          accept={["*/*"] as any}
+          accept={{}}
           multiple={true}
           activateOnClick={false}
           style={{
@@ -147,12 +154,12 @@ const FileManager: React.FC<FileManagerProps> = ({ selectedTool }) => {
           <FileManagerProvider
             recentFiles={recentFiles}
             onFilesSelected={handleFilesSelected}
+            onNewFilesSelect={handleNewFileUpload}
             onClose={closeFilesModal}
             isFileSupported={isFileSupported}
             isOpen={isFilesModalOpen}
             onFileRemove={handleRemoveFileByIndex}
             modalHeight={modalHeight}
-            storeFile={storeFile}
             refreshRecentFiles={refreshRecentFiles}
           >
             {isMobile ? <MobileLayout /> : <DesktopLayout />}