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/ui/Notification/Notification.tsx

@@ -11,19 +11,14 @@ export interface NotificationProps {
 }
 
 const ICONS: Record<NotificationVariant, React.ReactNode> = {
-  info:    <Info size={16} />,
+  info: <Info size={16} />,
   success: <CheckCircle2 size={16} />,
-  error:   <AlertCircle size={16} />,
+  error: <AlertCircle size={16} />,
   warning: <AlertTriangle size={16} />,
-  note:    <StickyNote size={16} />,
+  note: <StickyNote size={16} />,
 };
 
-export function Notification({
-  variant = 'info',
-  title,
-  children,
-  className,
-}: NotificationProps) {
+export function Notification({ variant = 'info', title, children, className }: NotificationProps) {
   return (
     <div className={[styles.notification, styles[variant], className].filter(Boolean).join(' ')}>
       <span className={styles.icon}>{ICONS[variant]}</span>