feat: add scenarios list page with metrics and quick actions

- Introduced a new template for listing scenarios associated with a project.
- Added metrics for total, active, draft, and archived scenarios.
- Implemented quick actions for creating new scenarios and reviewing project overview.
- Enhanced navigation with breadcrumbs for better user experience.

refactor: update Opex and Profitability templates for consistency

- Changed titles and button labels for clarity in Opex and Profitability templates.
- Updated form IDs and action URLs for better alignment with new naming conventions.
- Improved navigation links to include scenario and project overviews.

test: add integration tests for Opex calculations

- Created new tests for Opex calculation HTML and JSON flows.
- Validated successful calculations and ensured correct data persistence.
- Implemented tests for currency mismatch and unsupported frequency scenarios.

test: enhance project and scenario route tests

- Added tests to verify scenario list rendering and calculator shortcuts.
- Ensured scenario detail pages link back to the portfolio correctly.
- Validated project detail pages show associated scenarios accurately.

routes/exports.py

@@ -7,7 +7,6 @@ from typing import Annotated
 
 from fastapi import APIRouter, Depends, HTTPException, Request, Response, status
 from fastapi.responses import HTMLResponse, StreamingResponse
-from fastapi.templating import Jinja2Templates
 
 from dependencies import get_unit_of_work, require_any_role
 from schemas.exports import (
@@ -24,10 +23,12 @@ from services.export_serializers import (
 from services.unit_of_work import UnitOfWork
 from models.import_export_log import ImportExportLog
 from monitoring.metrics import observe_export
+from routes.template_filters import create_templates
 
 logger = logging.getLogger(__name__)
 
 router = APIRouter(prefix="/exports", tags=["exports"])
+templates = create_templates()
 
 
 @router.get(
@@ -49,7 +50,6 @@ async def export_modal(
     submit_url = request.url_for(
         "export_projects" if dataset == "projects" else "export_scenarios"
     )
-    templates = Jinja2Templates(directory="templates")
     return templates.TemplateResponse(
         request,
         "exports/modal.html",