chore(deps): upgrade @mantine/hooks to v9

v9 splits useFullscreen into useFullscreenElement (ref-based) and
useFullscreenDocument. NavigationMenu never attached the ref, and v8's
useFullscreen fell back to document.documentElement in that case, so
useFullscreenDocument is a behaviourally identical swap.

Every other hook in use is unaffected. The one other breaking change —
useLocalStorage/useSessionStorage now return `T | undefined` when no
defaultValue is given — does not apply: all nine call sites pass one.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NWs1vf42msmoJ21ABvQMpm

apps/client/package.json

@@ -13,7 +13,7 @@
     "@dnd-kit/sortable": "^10.0.0",
     "@dnd-kit/utilities": "^3.2.2",
     "@fontsource/open-sans": "^5.2.7",
-    "@mantine/hooks": "^8.3.7",
+    "@mantine/hooks": "^9.5.1",
     "@sentry/react": "^10.59.0",
     "@table-nav/react": "^0.0.7",
     "@tanstack/react-query": "^5.101.0",