Reorganize admin into tabbed hubs with a condensed sidebar.

Replace the long flat nav with hub entries, shared AdminHubChrome tabs, and AdminPageShell. Existing URLs stay stable; Settings/Radio and other sections now share one chrome.

Co-authored-by: Cursor <[email protected]>

src/messages/en.json

@@ -690,6 +690,9 @@
 				"overview": "Overview",
 				"dashboard": "Dashboard",
 				"content": "Content",
+				"hubNewsMedia": "News & media",
+				"hubSiteContent": "Site content",
+				"hubEngagement": "Engagement",
 				"articles": "Articles",
 				"tags": "Tags",
 				"navigator": "Navigator",
@@ -703,6 +706,8 @@
 				"banners": "Banners",
 				"prefixes": "Prefixes",
 				"usersAndAccess": "Users & access",
+				"hubUsers": "Users",
+				"hubAccess": "Access & security",
 				"users": "Users",
 				"bans": "Bans",
 				"ipManagement": "IP management",
@@ -713,6 +718,8 @@
 				"onlineUsers": "Online users",
 				"moderation": "Moderation",
 				"economy": "Economy",
+				"hubCatalog": "Catalog & rares",
+				"hubShop": "Shop & payments",
 				"catalog": "Catalog",
 				"shop": "Shop",
 				"transactions": "Transactions",
@@ -734,6 +741,8 @@
 				"radioRanks": "Ranks",
 				"radioAutodj": "Auto DJ",
 				"system": "System",
+				"hubTools": "Tools",
+				"hubObservability": "Observability",
 				"commandocentrum": "Commandocentrum",
 				"emulator": "Emulator",
 				"alerts": "Alerts",