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/components/nav-tile/index.tsx

@@ -0,0 +1,28 @@
+import { Text, UnstyledButton } from "@mantine/core";
+import { Icon } from "@phosphor-icons/react";
+import classes from "./nav-tile.module.css";
+
+interface NavTileProps {
+  label: string;
+  Icon: Icon;
+  onClick?: () => void;
+  disabled?: boolean;
+}
+
+/** A single square-ish nav tile with icon-over-label and press feedback. */
+export const NavTile = ({ label, Icon, onClick, disabled }: NavTileProps) => (
+  <UnstyledButton
+    className={`${classes.tile} flxn-tile`}
+    onClick={onClick}
+    disabled={disabled}
+  >
+    <span className={`${classes.icon} flxn-tile-icon`}>
+      <Icon size={22} weight="bold" />
+    </span>
+    <Text size="xs" fw={600} lineClamp={2} lh={1.2}>
+      {label}
+    </Text>
+  </UnstyledButton>
+);
+
+export default NavTile;