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.

static/css/projects.css

@@ -153,18 +153,6 @@
   }
 }
 
-.alert {
-  padding: 0.75rem 1rem;
-  border-radius: var(--radius-sm);
-  margin-bottom: 1rem;
-}
-
-.alert-error {
-  background: rgba(209, 75, 75, 0.2);
-  border: 1px solid rgba(209, 75, 75, 0.4);
-  color: var(--color-text-invert);
-}
-
 .form {
   display: flex;
   flex-direction: column;