feat(client): add create/edit environment pages and hoverable cards

- add CreateEnvironmentPage and EditEnvironmentPage with pre-filled form
- add /environments/new and /environments/:id/edit routes
- add Edit option to card context menu and detail page toolbar
- move env id pill to card footer (left), timestamp stays right
- make env cards clickable (navigate to detail); cog stops propagation
- add hoverable Card variant with primary border+shadow on hover
- add link color tokens and global anchor styles for both themes
- fix Timestamp pill visibility in dark mode with border token
- add DescriptionList truncate prop with ellipsis and title tooltip
- stack DescriptionList dd below dt with 8px gap between items

client/src/i18n/locales/en.json

@@ -17,6 +17,19 @@
     "menu_label": "Environment options",
     "action_view": "View details",
     "action_delete": "Delete",
+    "action_add": "Add environment",
+    "action_edit": "Edit",
+    "action_save": "Create",
+    "action_update": "Save changes",
+    "action_cancel": "Cancel",
+    "create_title": "New Environment",
+    "edit_title": "Edit Environment",
+    "form_name": "Name",
+    "form_name_placeholder": "e.g. staging, production",
+    "form_name_required": "Name is required",
+    "form_id_url": "ID URL",
+    "form_cabinet_url": "Cabinet URL",
+    "form_admin_url": "Admin URL",
     "back": "Environments",
     "field_id": "ID",
     "field_created": "Created",