refactor(telemetry): chart scale labels, calmer vitals and error styling, usage-first tabs

- sparklines get start/end date and max-value footers
- vitals rating shown by value color instead of badges
- error rows use plain counts, subtle resolve button, terse empty state
- telemetry tab order: usage, players, functions, events, errors; usage is default

src/app/routes/_authed/admin/telemetry/index.tsx

@@ -2,6 +2,6 @@ import { createFileRoute, redirect } from "@tanstack/react-router";
 
 export const Route = createFileRoute("/_authed/admin/telemetry/")({
   beforeLoad: () => {
-    throw redirect({ to: "/admin/telemetry/functions" });
+    throw redirect({ to: "/admin/telemetry/usage" });
   },
 });