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.

tests/test_import_export_integration.py

@@ -1,16 +1,12 @@
 from __future__ import annotations
 
-from io import BytesIO
 
-import pandas as pd
 import pytest
 from fastapi.testclient import TestClient
 
 from models import (
     MiningOperationType,
     Project,
-    Scenario,
-    ScenarioStatus,
 )
 from models.import_export_log import ImportExportLog