Fix Jinja2 TemplateResponse for Starlette 1.0 API

Starlette 1.0 changed TemplateResponse signature to require
request as first positional arg and context as keyword arg.
Updated all four TemplateResponse calls to match new API.

Author: devnen

server.py

@@ -831,7 +831,7 @@ async def get_web_ui(request: Request):
             "success": None,
         }
 
-        return templates.TemplateResponse("index.html", template_context)
+        return templates.TemplateResponse(request, "index.html", context=template_context)
 
     except Exception as e:
         logger.error(f"Error rendering Web UI: {e}", exc_info=True)
@@ -909,7 +909,7 @@ async def handle_web_ui_generate(
             "output_file_url": None,
             "generation_time": None,
         }
-        return templates.TemplateResponse("index.html", error_context, status_code=503)
+        return templates.TemplateResponse(request, "index.html", context=error_context, status_code=503)
 
     # --- Start processing the valid request ---
     logger.info(
@@ -1053,7 +1053,7 @@ async def handle_web_ui_generate(
             "generation_time": None,
         }
         return templates.TemplateResponse(
-            "index.html", error_context, status_code=400
+            request, "index.html", context=error_context, status_code=400
         )  # Bad Request
 
     # --- Generation ---
@@ -1219,9 +1219,10 @@ async def handle_web_ui_generate(
 
     # Render and return the HTML response
     return templates.TemplateResponse(
+        request,
         "index.html",
-        template_context,  # Pass the complete context dictionary
-        status_code=status_code,  # Set appropriate HTTP status
+        context=template_context,
+        status_code=status_code,
     )