feat(scenarios): add detail page, comfortable DescriptionList layout, and environment card refactor

- Add ScenarioDetailPage with DescriptionList, steps table, run/delete actions
- Add /scenarios/:id route
- Add i18n keys for scenario detail fields, steps columns, and 404 error
- Add 'comfortable' and 'inline' layout variants to DescriptionList (with compact as default stacked)
- Apply layout="comfortable" to session, environment, and scenario detail pages
- Apply layout="compact" to EnvironmentsPage card DescriptionList
- Refactor EnvironmentsPage card to use ContextMenu (view/edit/delete) with icons
- Add ScenariosPage clickable rows, Play icon (primary) and Trash2 icon (danger) action buttons
- Add Page.module.css sectionHeading and stepsSection utility classes
- Fix Notification.tsx and Table.tsx formatting (prettier)

client/src/pages/Page.module.css

@@ -5,6 +5,17 @@
   color: var(--color-text);
 }
 
+.sectionHeading {
+  margin: var(--space-6) 0 var(--space-3);
+  font-size: var(--font-size-md);
+  font-weight: 600;
+  color: var(--color-text);
+}
+
+.stepsSection {
+  margin-top: var(--space-2);
+}
+
 .breadcrumbs {
   margin-bottom: var(--space-4);
 }