refactor(admin): align admin ui with app design language

- dashboard: card grid replaced by status strip + nav-tile section + list
- nav-tile promoted to shared component
- stat tiles and usage screen de-carded, sections divided like settings
- hub run tournament back to a list row
- telemetry link restored in tools list

src/features/admin/components/dashboard/tournament-section.tsx

@@ -0,0 +1,48 @@
+import { SimpleGrid, Text, Title } from "@mantine/core";
+import { useLingui } from "@lingui/react/macro";
+import { useNavigate } from "@tanstack/react-router";
+import { GearIcon, PlayIcon, UsersThreeIcon } from "@phosphor-icons/react";
+import { useCurrentTournament } from "@/features/tournaments/queries";
+import { NavTile } from "@/components/nav-tile";
+import { Countdown } from "@/components/countdown";
+import SectionBox from "./section-box";
+
+export const TournamentSection = () => {
+  const { t } = useLingui();
+  const navigate = useNavigate();
+  const { data: tournament } = useCurrentTournament();
+
+  if (!tournament) return null;
+
+  const upcoming = !!tournament.start_time && Date.parse(tournament.start_time) > Date.now();
+
+  return (
+    <SectionBox>
+      <Title order={3}>{tournament.name}</Title>
+      {upcoming && (
+        <Text size="sm" c="dimmed" component="div">
+          <Countdown date={new Date(tournament.start_time)} label={t`Starts in`} />
+        </Text>
+      )}
+      <SimpleGrid cols={3} spacing="sm" mt="sm">
+        <NavTile
+          label={t`Run`}
+          Icon={PlayIcon}
+          onClick={() => navigate({ to: `/admin/tournaments/run/${tournament.id}` })}
+        />
+        <NavTile
+          label={t`Enrollment`}
+          Icon={UsersThreeIcon}
+          onClick={() => navigate({ to: `/admin/tournaments/${tournament.id}/enrollment` })}
+        />
+        <NavTile
+          label={t`Manage`}
+          Icon={GearIcon}
+          onClick={() => navigate({ to: `/admin/tournaments/${tournament.id}` })}
+        />
+      </SimpleGrid>
+    </SectionBox>
+  );
+};
+
+export default TournamentSection;