feat: Add main CSS styles for the application

feat: Refactor Dashboard template to extend base layout and improve structure

feat: Enhance Parameter Input template with improved layout and feedback mechanisms

feat: Update Scenario Form template to utilize base layout and improve user experience

feat: Create base layout template for consistent styling across pages

feat: Add Consumption, Costs, Equipment, Maintenance, Production, Reporting, and Simulations templates with placeholders for future functionality

feat: Implement base header and footer partials for consistent navigation and footer across the application

middleware/validation.py

@@ -1,7 +1,10 @@
-from fastapi import Request, HTTPException
+from typing import Awaitable, Callable
 
+from fastapi import HTTPException, Request, Response
 
-async def validate_json(request: Request, call_next):
+MiddlewareCallNext = Callable[[Request], Awaitable[Response]]
+
+async def validate_json(request: Request, call_next: MiddlewareCallNext) -> Response:
     # Only validate JSON for requests with a body
     if request.method in ("POST", "PUT", "PATCH"):
         try: