fix: robust HTML delivery for downloads section

- Decoupled downloads container from main template to prevent static rendering errors
- Forced HTMX polling to use html=1 parameter
- Added server-side debug logging for request format detection
- Fixed Jinja2 loop error by ensuring tasks are provided via HTMX

app/routers/router_downloads.py

@@ -27,14 +27,15 @@ async def get_downloads(
     """Get list of all download tasks. Returns HTML for HTMX."""
     tasks = download_manager.get_all_tasks()
     
-    # Check for HTMX or explicit HTML request
+    # Force HTML if requested or via HTMX
     if html or request.headers.get("HX-Request"):
-        print(f"[DOWNLOADS] Returning HTML list for {len(tasks)} tasks")
+        print(f"[DOWNLOADS] HTMX Request detected. Returning HTML for {len(tasks)} tasks.")
         return templates.TemplateResponse(
             "components/downloads_list.html",
             {"request": request, "tasks": tasks}
         )
         
+    print(f"[DOWNLOADS] API Request detected. Returning JSON.")
     return {"downloads": tasks}