Feature/v2/pageeditor improved (#4289)

# Description of Changes

<!--
Please provide a summary of the changes, including:

Rewrite of page editor to make it work properly.  
Added page breaks
Added merged file support
Added "insert file" support
Slight Ux improvements

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: Anthony Stirling <[email protected]>

frontend/src/contexts/FileContext.tsx

@@ -73,8 +73,8 @@ function FileContextInner({
   }, []);
 
   // File operations using unified addFiles helper with persistence
-  const addRawFiles = useCallback(async (files: File[]): Promise<File[]> => {
-    const addedFilesWithIds = await addFiles('raw', { files }, stateRef, filesRef, dispatch, lifecycleManager);
+  const addRawFiles = useCallback(async (files: File[], options?: { insertAfterPageId?: string }): Promise<File[]> => {
+    const addedFilesWithIds = await addFiles('raw', { files, ...options }, stateRef, filesRef, dispatch, lifecycleManager);
     
     // Persist to IndexedDB if enabled
     if (indexedDB && enablePersistence && addedFilesWithIds.length > 0) {
@@ -167,7 +167,16 @@ function FileContextInner({
       filesRef.current.clear();
       dispatch({ type: 'RESET_CONTEXT' });
       
-      // Clear IndexedDB if enabled
+      // Don't clear IndexedDB automatically - only clear in-memory state
+      // IndexedDB should only be cleared when explicitly requested by user
+    },
+    clearAllData: async () => {
+      // First clear all files from memory
+      lifecycleManager.cleanupAllFiles();
+      filesRef.current.clear();
+      dispatch({ type: 'RESET_CONTEXT' });
+      
+      // Then clear IndexedDB storage
       if (indexedDB && enablePersistence) {
         try {
           await indexedDB.clearAll();