feat: add scenarios list page with metrics and quick actions

- Introduced a new template for listing scenarios associated with a project.
- Added metrics for total, active, draft, and archived scenarios.
- Implemented quick actions for creating new scenarios and reviewing project overview.
- Enhanced navigation with breadcrumbs for better user experience.

refactor: update Opex and Profitability templates for consistency

- Changed titles and button labels for clarity in Opex and Profitability templates.
- Updated form IDs and action URLs for better alignment with new naming conventions.
- Improved navigation links to include scenario and project overviews.

test: add integration tests for Opex calculations

- Created new tests for Opex calculation HTML and JSON flows.
- Validated successful calculations and ensured correct data persistence.
- Implemented tests for currency mismatch and unsupported frequency scenarios.

test: enhance project and scenario route tests

- Added tests to verify scenario list rendering and calculator shortcuts.
- Ensured scenario detail pages link back to the portfolio correctly.
- Validated project detail pages show associated scenarios accurately.

templates/projects/form.html

@@ -16,26 +16,21 @@
     {% endif %}
   </nav>
 
-  <header class="page-header">
-    <div>
-      <h1>{% if project %}Edit Project{% else %}Create Project{% endif %}</h1>
-      <p class="text-muted">Provide core information about the mining project.</p>
-    </div>
-    <div class="header-actions">
-      <a class="btn" href="{{ cancel_url }}">Cancel</a>
-      <button class="btn primary" type="submit">Save Project</button>
-    </div>
-  </header>
-
   {% if error %}
     <div class="alert alert-error">{{ error }}</div>
   {% endif %}
+  <form class="form project-form" method="post" action="{{ form_action }}">
+    <header class="page-header">
+      <div>
+        <h1>{% if project %}Edit Project{% else %}Create Project{% endif %}</h1>
+        <p class="text-muted">Provide core information about the mining project.</p>
+      </div>
+      <div class="header-actions">
+        <a class="btn" href="{{ cancel_url }}">Cancel</a>
+        <button class="btn primary" type="submit">Save Project</button>
+      </div>
+    </header>
 
-    {% if error %}
-      <div class="alert alert-error">{{ error }}</div>
-    {% endif %}
-
-    <form class="form project-form" method="post" action="{{ form_action }}">
     <div class="form-grid">
       <div class="form-group">
         <label for="name">Name</label>