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.

models/__init__.py

@@ -27,11 +27,13 @@ from .project import Project
 from .scenario import Scenario
 from .simulation_parameter import SimulationParameter
 from .user import Role, User, UserRole, password_context
+from .navigation import NavigationGroup, NavigationLink
+
 from .profitability_snapshot import ProjectProfitability, ScenarioProfitability
 from .capex_snapshot import ProjectCapexSnapshot, ScenarioCapexSnapshot
-from .processing_opex_snapshot import (
-    ProjectProcessingOpexSnapshot,
-    ScenarioProcessingOpexSnapshot,
+from .opex_snapshot import (
+    ProjectOpexSnapshot,
+    ScenarioOpexSnapshot,
 )
 
 __all__ = [
@@ -41,14 +43,14 @@ __all__ = [
     "Project",
     "ProjectProfitability",
     "ProjectCapexSnapshot",
-    "ProjectProcessingOpexSnapshot",
+    "ProjectOpexSnapshot",
     "PricingSettings",
     "PricingMetalSettings",
     "PricingImpuritySettings",
     "Scenario",
     "ScenarioProfitability",
     "ScenarioCapexSnapshot",
-    "ScenarioProcessingOpexSnapshot",
+    "ScenarioOpexSnapshot",
     "ScenarioStatus",
     "DistributionType",
     "SimulationParameter",
@@ -65,4 +67,6 @@ __all__ = [
     "UserRole",
     "password_context",
     "PerformanceMetric",
+    "NavigationGroup",
+    "NavigationLink",
 ]