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/template_filters.py

@@ -1,10 +1,19 @@
 from __future__ import annotations
 
+import logging
 from datetime import datetime, timezone
 from typing import Any
 
+from fastapi import Request
 from fastapi.templating import Jinja2Templates
 
+from services.navigation import NavigationService
+from services.session import AuthSession
+from services.unit_of_work import UnitOfWork
+
+
+logger = logging.getLogger(__name__)
+
 
 def format_datetime(value: Any) -> str:
     """Render datetime values consistently for templates."""
@@ -85,6 +94,47 @@ def register_common_filters(templates: Jinja2Templates) -> None:
     templates.env.filters["period_display"] = period_display
 
 
+def _sidebar_navigation_for_request(request: Request | None):
+    if request is None:
+        return None
+
+    cached = getattr(request.state, "_navigation_sidebar_dto", None)
+    if cached is not None:
+        return cached
+
+    session_context = getattr(request.state, "auth_session", None)
+    if isinstance(session_context, AuthSession):
+        session = session_context
+    else:
+        session = AuthSession.anonymous()
+
+    try:
+        with UnitOfWork() as uow:
+            if not uow.navigation:
+                logger.debug("Navigation repository unavailable for sidebar rendering")
+                sidebar_dto = None
+            else:
+                service = NavigationService(uow.navigation)
+                sidebar_dto = service.build_sidebar(session=session, request=request)
+    except Exception:  # pragma: no cover - defensive fallback for templates
+        logger.exception("Failed to build sidebar navigation during template render")
+        sidebar_dto = None
+
+    setattr(request.state, "_navigation_sidebar_dto", sidebar_dto)
+    return sidebar_dto
+
+
+def register_navigation_globals(templates: Jinja2Templates) -> None:
+    templates.env.globals["get_sidebar_navigation"] = _sidebar_navigation_for_request
+
+
+def create_templates() -> Jinja2Templates:
+    templates = Jinja2Templates(directory="templates")
+    register_common_filters(templates)
+    register_navigation_globals(templates)
+    return templates
+
+
 __all__ = [
     "format_datetime",
     "currency_display",
@@ -92,4 +142,6 @@ __all__ = [
     "percentage_display",
     "period_display",
     "register_common_filters",
+    "register_navigation_globals",
+    "create_templates",
 ]