feat: Add NPV comparison and distribution charts to reporting

- Implemented NPV comparison chart generation using Plotly in ReportingService.
- Added distribution histogram for Monte Carlo results.
- Updated reporting templates to include new charts and improved layout.
- Created new settings and currencies management pages.
- Enhanced sidebar navigation with dynamic URL handling.
- Improved CSS styles for chart containers and overall layout.
- Added new simulation and theme settings pages with placeholders for future features.

templates/simulations.html

@@ -0,0 +1,16 @@
+{% extends "base.html" %}
+{% block title %}{{ title }} | CalMiner{% endblock %}
+
+{% block content %}
+  {% include "partials/reports_header.html" %}
+
+  <section class="report-overview">
+    <div class="report-grid">
+      <article class="report-card">
+        <h2>Simulation Dashboard</h2>
+        <p class="muted">Run and monitor Monte Carlo simulations across scenarios.</p>
+        <p class="muted">This feature is coming soon.</p>
+      </article>
+    </div>
+  </section>
+{% endblock %}