Feature/v2/multiselect (#4024)

# Description of Changes
This pull request introduces significant updates to the file selection
logic, tool rendering, and file context management in the frontend
codebase. The changes aim to improve modularity, enhance
maintainability, and streamline the handling of file-related operations.
Key updates include the introduction of a new `FileSelectionContext`,
refactoring of file selection logic, and updates to tool management and
rendering.

### File Selection Context and Logic Refactor:
* Added a new `FileSelectionContext` to centralize file selection state
and provide utility hooks for managing selected files, selection limits,
and tool mode. (`frontend/src/contexts/FileSelectionContext.tsx`,
[frontend/src/contexts/FileSelectionContext.tsxR1-R77](diffhunk://#diff-bda35f1aaa5eafa0a0dc48e0b1270d862f6da360ba1241234e891f0ca8907327R1-R77))
* Replaced local file selection logic in `FileEditor` with context-based
logic, improving consistency and reducing duplication.
(`frontend/src/components/fileEditor/FileEditor.tsx`,
[[1]](diffhunk://#diff-481d0a2d8a1714d34d21181db63a020b08dfccfbfa80bf47ac9af382dff25310R63-R70)
[[2]](diffhunk://#diff-481d0a2d8a1714d34d21181db63a020b08dfccfbfa80bf47ac9af382dff25310R404-R438)

### Tool Management and Rendering:
* Refactored `ToolRenderer` to use a `Suspense` fallback for lazy-loaded
tools, improving user experience during tool loading.
(`frontend/src/components/tools/ToolRenderer.tsx`,
[frontend/src/components/tools/ToolRenderer.tsxL32-L64](diffhunk://#diff-2083701113aa92cd1f5ce1b4b52cc233858e31ed7bcf39c5bfb1bcc34e99b6a9L32-L64))
* Simplified `ToolPicker` by reusing the `ToolRegistry` type, reducing
redundancy. (`frontend/src/components/tools/ToolPicker.tsx`,
[frontend/src/components/tools/ToolPicker.tsxL4-R4](diffhunk://#diff-e47deca9132018344c159925f1264794acdd57f4b65e582eb9b2a4ea69ec126dL4-R4))

### File Context Enhancements:
* Introduced a utility function `getFileId` for consistent file ID
extraction, replacing repetitive inline logic.
(`frontend/src/contexts/FileContext.tsx`,
[[1]](diffhunk://#diff-95b3d103fa434f81fdae55f2ea14eda705f0def45a0f2c5754f81de6f2fd93bcR25)
[[2]](diffhunk://#diff-95b3d103fa434f81fdae55f2ea14eda705f0def45a0f2c5754f81de6f2fd93bcL101-R102)
* Updated `FileContextProvider` to use more specific types for PDF
documents, enhancing type safety.
(`frontend/src/contexts/FileContext.tsx`,
[[1]](diffhunk://#diff-95b3d103fa434f81fdae55f2ea14eda705f0def45a0f2c5754f81de6f2fd93bcL350-R351)
[[2]](diffhunk://#diff-95b3d103fa434f81fdae55f2ea14eda705f0def45a0f2c5754f81de6f2fd93bcL384-R385)

### Compression Tool Enhancements:
* Added blob URL cleanup logic to the compression hook to prevent memory
leaks. (`frontend/src/hooks/tools/compress/useCompressOperation.ts`,
[frontend/src/hooks/tools/compress/useCompressOperation.tsR58-L66](diffhunk://#diff-d7815fea0e89989511ae1786f7031cba492b9f2db39b7ade92d9736d1bd4b673R58-L66))
* Adjusted file ID generation in the compression operation to handle
multiple files more effectively.
(`frontend/src/hooks/tools/compress/useCompressOperation.ts`,
[frontend/src/hooks/tools/compress/useCompressOperation.tsL90-R102](diffhunk://#diff-d7815fea0e89989511ae1786f7031cba492b9f2db39b7ade92d9736d1bd4b673L90-R102))

---

## 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/contexts/FileContext.tsx

@@ -22,6 +22,7 @@ import { useEnhancedProcessedFiles } from '../hooks/useEnhancedProcessedFiles';
 import { fileStorage } from '../services/fileStorage';
 import { enhancedPDFProcessingService } from '../services/enhancedPDFProcessingService';
 import { thumbnailGenerationService } from '../services/thumbnailGenerationService';
+import { getFileId } from '../utils/fileUtils';
 
 // Initial state
 const initialViewerConfig: ViewerConfig = {
@@ -98,7 +99,7 @@ function fileContextReducer(state: FileContextState, action: FileContextAction):
 
     case 'REMOVE_FILES':
       const remainingFiles = state.activeFiles.filter(file => {
-        const fileId = (file as any).id || file.name;
+        const fileId = getFileId(file);
         return !action.payload.includes(fileId);
       });
       const safeSelectedFileIds = Array.isArray(state.selectedFileIds) ? state.selectedFileIds : [];
@@ -347,7 +348,7 @@ export function FileContextProvider({
   // Cleanup timers and refs
   const cleanupTimers = useRef<Map<string, NodeJS.Timeout>>(new Map());
   const blobUrls = useRef<Set<string>>(new Set());
-  const pdfDocuments = useRef<Map<string, any>>(new Map());
+  const pdfDocuments = useRef<Map<string, PDFDocument>>(new Map());
   
   // Enhanced file processing hook
   const {
@@ -381,7 +382,7 @@ export function FileContextProvider({
     blobUrls.current.add(url);
   }, []);
 
-  const trackPdfDocument = useCallback((fileId: string, pdfDoc: any) => {
+  const trackPdfDocument = useCallback((fileId: string, pdfDoc: PDFDocument) => {
     // Clean up existing document for this file if any
     const existing = pdfDocuments.current.get(fileId);
     if (existing && existing.destroy) {
@@ -498,7 +499,7 @@ export function FileContextProvider({
       for (const file of files) {
         try {
           // Check if file already has an ID (already in IndexedDB)
-          const fileId = (file as any).id;
+          const fileId = getFileId(file);
           if (!fileId) {
             // File doesn't have ID, store it and get the ID
             const storedFile = await fileStorage.storeFile(file);
@@ -680,7 +681,7 @@ export function FileContextProvider({
   // Utility functions
   const getFileById = useCallback((fileId: string): File | undefined => {
     return state.activeFiles.find(file => {
-      const actualFileId = (file as any).id || file.name;
+      const actualFileId = getFileId(file);
       return actualFileId === fileId;
     });
   }, [state.activeFiles]);