Feature/v2/more landing zones (#4575)

# Description of Changes

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Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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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: Copilot <[email protected]>

frontend/src/components/fileEditor/FileEditor.tsx

@@ -8,6 +8,7 @@ import { useNavigationActions } from '../../contexts/NavigationContext';
 import { zipFileService } from '../../services/zipFileService';
 import { detectFileExtension } from '../../utils/fileUtils';
 import FileEditorThumbnail from './FileEditorThumbnail';
+import AddFileCard from './AddFileCard';
 import FilePickerModal from '../shared/FilePickerModal';
 import SkeletonLoader from '../shared/SkeletonLoader';
 import { FileId, StirlingFile } from '../../types/fileContext';
@@ -171,8 +172,8 @@ const FileEditor = ({
 
       // Process all extracted files
       if (allExtractedFiles.length > 0) {
-        // Add files to context (they will be processed automatically)
-        await addFiles(allExtractedFiles);
+        // Add files to context and select them automatically
+        await addFiles(allExtractedFiles, { selectFiles: true });
         showStatus(`Added ${allExtractedFiles.length} files`, 'success');
       }
     } catch (err) {
@@ -405,6 +406,14 @@ const FileEditor = ({
               pointerEvents: 'auto'
             }}
           >
+            {/* Add File Card - only show when files exist */}
+            {activeStirlingFileStubs.length > 0 && (
+              <AddFileCard
+                key="add-file-card"
+                onFileSelect={handleFileUpload}
+              />
+            )}
+
             {activeStirlingFileStubs.map((record, index) => {
               return (
                 <FileEditorThumbnail