feat(client): add ContextMenu component, environment cards, detail page, and breadcrumbs

- add ContextMenu component with click-outside/Escape dismiss, align prop, and danger variant
- replace EnvironmentsPage table with responsive card grid
- add cog button to each card opening a context menu with view and delete actions
- add EnvironmentDetailPage at /environments/:id with meta grid, URLs card, and delete
- add Breadcrumbs to all pages; detail page uses two-item trail with delete button inline
- add Table stories for pagination and Timestamp column

client/.storybook/stories/Table.stories.tsx

@@ -22,9 +22,27 @@ interface User {
 const daysAgo = (n: number) => new Date(Date.now() - n * 86_400_000).toISOString();
 
 const users: User[] = [
-  { id: 1, name: 'Alice Müller', email: 'alice@example.com', status: 'active', updatedAt: daysAgo(1) },
-  { id: 2, name: 'Bob Nguyen', email: 'bob@example.com', status: 'inactive', updatedAt: daysAgo(5) },
-  { id: 3, name: 'Carol Santos', email: 'carol@example.com', status: 'active', updatedAt: daysAgo(30) },
+  {
+    id: 1,
+    name: 'Alice Müller',
+    email: 'alice@example.com',
+    status: 'active',
+    updatedAt: daysAgo(1),
+  },
+  {
+    id: 2,
+    name: 'Bob Nguyen',
+    email: 'bob@example.com',
+    status: 'inactive',
+    updatedAt: daysAgo(5),
+  },
+  {
+    id: 3,
+    name: 'Carol Santos',
+    email: 'carol@example.com',
+    status: 'active',
+    updatedAt: daysAgo(30),
+  },
 ];
 
 const manyUsers: User[] = Array.from({ length: 47 }, (_, i) => ({