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_api.py

@@ -3,7 +3,6 @@ from __future__ import annotations
 from fastapi.testclient import TestClient
 
 from models.project import MiningOperationType, Project
-from models.scenario import Scenario, ScenarioStatus
 
 
 def test_project_import_preview_and_commit_flow(