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.

templates/login.html

@@ -26,7 +26,7 @@
       <label for="password">Password:</label>
       <input type="password" id="password" name="password" required />
     </div>
-    <button type="submit">Login</button>
+    <button type="submit" class="btn primary">Login</button>
   </form>
   <p>Don't have an account? <a href="/register">Register here</a></p>
   <p><a href="/forgot-password">Forgot password?</a></p>