feat: add integration tests for project and scenario lifecycles, update templates to new Starlette signature, and optimize project retrieval logic

routes/scenarios.py

@@ -218,9 +218,9 @@ def create_scenario_form(
         ) from exc
 
     return templates.TemplateResponse(
+        request,
         "scenarios/form.html",
         {
-            "request": request,
             "project": project,
             "scenario": None,
             "scenario_statuses": _scenario_status_choices(),
@@ -291,9 +291,9 @@ def create_scenario_submit(
         uow.scenarios.create(scenario)
     except EntityConflictError as exc:
         return templates.TemplateResponse(
+            request,
             "scenarios/form.html",
             {
-                "request": request,
                 "project": project,
                 "scenario": scenario,
                 "scenario_statuses": _scenario_status_choices(),
@@ -347,9 +347,9 @@ def view_scenario(
     }
 
     return templates.TemplateResponse(
+        request,
         "scenarios/detail.html",
         {
-            "request": request,
             "project": project,
             "scenario": scenario,
             "scenario_metrics": scenario_metrics,
@@ -378,9 +378,9 @@ def edit_scenario_form(
     project = uow.projects.get(scenario.project_id)
 
     return templates.TemplateResponse(
+        request,
         "scenarios/form.html",
         {
-            "request": request,
             "project": project,
             "scenario": scenario,
             "scenario_statuses": _scenario_status_choices(),