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/partials/base_header.html

@@ -1,10 +1,14 @@
 <div class="sidebar-inner">
   <a class="sidebar-brand" href="{{ request.url_for('dashboard.home') }}">
-    <span class="brand-logo" aria-hidden="true">CM</span>
+    <img src="/static/img/logo_big.png" alt="CalMiner Logo" class="brand-logo" />
     <div class="brand-text">
       <span class="brand-title">CalMiner</span>
       <span class="brand-subtitle">Mining Planner</span>
     </div>
   </a>
+  <div class="sidebar-nav-controls">
+    <button id="nav-prev" class="nav-chevron nav-chevron-prev" aria-label="Previous page">&larr;</button>
+    <button id="nav-next" class="nav-chevron nav-chevron-next" aria-label="Next page">&rarr;</button>
+  </div>
   {% include "partials/sidebar_nav.html" %}
 </div>