feat: add token-saver dashboard page

- extract token saver into its own route /dashboard/token-saver
- slim down EndpointPageClient
- add token-saver nav to Header and Sidebar

Co-authored-by: Cursor <cursoragent@cursor.com>

src/shared/components/Header.js

@@ -112,6 +112,13 @@ const getPageInfo = (pathname) => {
       icon: "security",
       breadcrumbs: [],
     };
+  if (pathname.includes("/token-saver"))
+    return {
+      title: "Token Saver",
+      description: "Compress prompts and outputs to save tokens",
+      icon: "savings",
+      breadcrumbs: [],
+    };
   if (pathname.includes("/cli-tools"))
     return {
       title: "CLI Tools",