feat: Enhance project and scenario creation with monitoring metrics

- Added monitoring metrics for project creation success and error handling in `ProjectRepository`.
- Implemented similar monitoring for scenario creation in `ScenarioRepository`.
- Refactored `run_monte_carlo` function in `simulation.py` to include timing and success/error metrics.
- Introduced new CSS styles for headers, alerts, and navigation buttons in `main.css` and `projects.css`.
- Created a new JavaScript file for navigation logic to handle chevron buttons.
- Updated HTML templates to include new navigation buttons and improved styling for buttons.
- Added tests for reporting service and routes to ensure proper functionality and access control.
- Removed unused imports and optimized existing test files for better clarity and performance.

routes/projects.py

@@ -15,7 +15,7 @@ from dependencies import (
 )
 from models import MiningOperationType, Project, ScenarioStatus, User
 from schemas.project import ProjectCreate, ProjectRead, ProjectUpdate
-from services.exceptions import EntityConflictError, EntityNotFoundError
+from services.exceptions import EntityConflictError
 from services.pricing import PricingMetadata
 from services.unit_of_work import UnitOfWork
 
@@ -138,7 +138,7 @@ def create_project_submit(
 
     try:
         op_type = MiningOperationType(operation_type)
-    except ValueError as exc:
+    except ValueError:
         return templates.TemplateResponse(
             request,
             "projects/form.html",
@@ -160,7 +160,7 @@ def create_project_submit(
     )
     try:
         created = _require_project_repo(uow).create(project)
-    except EntityConflictError as exc:
+    except EntityConflictError:
         return templates.TemplateResponse(
             request,
             "projects/form.html",
@@ -303,7 +303,7 @@ def edit_project_submit(
     if operation_type:
         try:
             project.operation_type = MiningOperationType(operation_type)
-        except ValueError as exc:
+        except ValueError:
             return templates.TemplateResponse(
                 request,
                 "projects/form.html",