fix(client): show the platform's own shortcut modifier

Lift the bulk rename empty state out of the vertical centre of the
tools pane so it sits near the top instead of floating in the void.

Replace the hardcoded Cmd in the settings search hint with a shared
useModifierKey composable, so Windows and Linux see Ctrl+K. The
translated hint now takes the combo as a placeholder.

client/src/locales/pt.json

@@ -3241,7 +3241,6 @@
       "searchPlaceholder": "Procurar nas configurações",
       "clearSearch": "Limpar busca",
       "noResults": "Nenhuma configuração corresponde a {query}.",
-      "shortcutHint": "Pressione Cmd K para pular para qualquer configuração",
       "status": {
         "scanning": "Analisando"
       },