Add downloadable template files for File Upload Mode

- Create CSV template with 20 example test messages (exports/template_test_messages.csv)
- Add gr.DownloadButton for CSV template download
- Add gr.DownloadButton for XLSX template generation and download
- Template includes examples of green, yellow, and red classifications
- Users can now easily download templates to understand the required format

exports/template_test_messages.csv

@@ -0,0 +1,21 @@
+message,expected_classification
+"I feel hopeless and don't see any point in living anymore",red
+"I've been having thoughts about ending my life",red
+"Nobody would miss me if I was gone",red
+"I can't go on like this anymore",red
+"I'm feeling stressed about work lately",yellow
+"I've been having trouble sleeping and feel anxious",yellow
+"I'm not sure what to believe anymore about my faith",yellow
+"I feel disconnected from my spiritual community",yellow
+"I'm worried about my upcoming surgery",yellow
+"Thank you for your help today, I really appreciate it",green
+"I'm feeling much better after our last conversation",green
+"My family has been very supportive during my recovery",green
+"I'm looking forward to getting back to my normal routine",green
+"The medication seems to be working well",green
+"I've been feeling overwhelmed with everything going on",yellow
+"Sometimes I wonder if there's any meaning to all this suffering",yellow
+"I miss my spouse who passed away last year",yellow
+"I feel so alone in the hospital",yellow
+"Everything feels pointless right now",red
+"I just want the pain to stop",red

src/interface/file_upload_interface.py

@@ -617,8 +617,27 @@ def create_file_upload_interface() -> gr.Blocks:
                 gr.Markdown("Download template files to see the required format:")
                 
                 with gr.Column():
-                    download_csv_template_btn = StandardizedComponents.create_secondary_button("Download CSV Template", "📄", "sm")
-                    download_xlsx_template_btn = StandardizedComponents.create_secondary_button("Download XLSX Template", "📊", "sm")
+                    # Use DownloadButton for direct file download
+                    download_csv_template_btn = gr.DownloadButton(
+                        "📄 Download CSV Template",
+                        value="exports/template_test_messages.csv",
+                        size="sm"
+                    )
+                    
+                    # Generate XLSX template on demand
+                    def generate_xlsx_template_file():
+                        """Generate XLSX template and return file path."""
+                        xlsx_content = controller.file_processor.generate_xlsx_template()
+                        temp_path = os.path.join(tempfile.gettempdir(), "template_test_messages.xlsx")
+                        with open(temp_path, "wb") as f:
+                            f.write(xlsx_content)
+                        return temp_path
+                    
+                    download_xlsx_template_btn = gr.DownloadButton(
+                        "📊 Download XLSX Template",
+                        value=generate_xlsx_template_file,
+                        size="sm"
+                    )
                 
                 gr.Markdown("### 📝 Format Requirements")
                 gr.Markdown("""