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/scenarios/capex.html

@@ -1,5 +1,5 @@
 {% extends "base.html" %}
-{% block title %}Initial Capex Planner · CalMiner{% endblock %}
+{% block title %}Capex Planner · CalMiner{% endblock %}
 
 {% block content %}
   <nav class="breadcrumb">
@@ -10,17 +10,24 @@
     {% if scenario %}
       <a href="{{ url_for('scenarios.view_scenario', scenario_id=scenario.id) }}">{{ scenario.name }}</a>
     {% endif %}
-  <span aria-current="page">Initial Capex Planner</span>
+  <span aria-current="page">Capex Planner</span>
   </nav>
 
   <header class="page-header">
     <div>
-      <h1>Initial Capex Planner</h1>
-      <p class="text-muted">Capture upfront capital requirements and review categorized totals.</p>
+      <h1>Capex Planner</h1>
+      <p class="text-muted">Plan capital requirements for {{ scenario.name if scenario else 'this scenario' }}.</p>
     </div>
     <div class="header-actions">
-      {% if cancel_url %}
-        <a class="btn" href="{{ cancel_url }}">Cancel</a>
+      {% if scenario_url %}
+        <a class="btn" href="{{ scenario_url }}">Scenario Overview</a>
+      {% elif project_url %}
+        <a class="btn" href="{{ project_url }}">Project Overview</a>
+      {% elif cancel_url %}
+        <a class="btn" href="{{ cancel_url }}">Back</a>
+      {% endif %}
+      {% if scenario_portfolio_url %}
+        <a class="btn" href="{{ scenario_portfolio_url }}">Scenario Portfolio</a>
       {% endif %}
       <button class="btn primary" type="submit" form="capex-form">Save &amp; Calculate</button>
     </div>
@@ -188,7 +195,7 @@
     {% if result %}
       <div class="report-grid">
         <article class="report-card">
-          <h3>Total Initial Capex</h3>
+          <h3>Total Capex</h3>
           <p class="metric">
             <strong>{{ result.totals.overall | currency_display(result.currency) }}</strong>
           </p>
@@ -249,7 +256,7 @@
         </table>
       {% endif %}
     {% else %}
-  <p class="muted">Provide component details and calculate to see initial capex totals.</p>
+  <p class="muted">Provide component details and calculate to see capex totals.</p>
     {% endif %}
   </section>