Added: Dashboard html file and routing

auth.py

@@ -102,6 +102,9 @@ async def auth_twitch_callback(code: str, state: str, request: Request, db: Sess
     
     db.commit()
     
+    # Create a session for the user by storing their database ID.
+    request.session['user_id'] = user.id
+
     # Redirect to a future dashboard page for a better user experience
     # This prepares us for Task 1.4 (Session Management) and Task 2.1 (Dashboard UI)
     return RedirectResponse(url="/dashboard")