Improve Switch-only MTP UI with drag export, i18n, and polish.

Ship Finder-style drag-out for files and folders, system-language packs with an Options override, About/menu bar support, and sorting plus selection UX fixes.

src/ui/webroot/lang/pt.json

@@ -0,0 +1,50 @@
+{
+  "app.title": "OmniMTP",
+  "badge.no_device": "Sem dispositivo",
+  "device.waiting": "Aguardando Nintendo Switch…",
+  "device.connected": "{name} conectada",
+  "device.nintendo_switch": "Nintendo Switch",
+  "btn.add_files": "Adicionar arquivos",
+  "btn.scan": "Procurar",
+  "btn.cancel_all": "Cancelar tudo",
+  "btn.go_up": "Subir",
+  "btn.refresh": "Atualizar",
+  "empty.no_switch_title": "Nenhuma Switch conectada",
+  "empty.no_switch_sub": "Conecte via USB-C e abra o DBI ou Sphaira MTP",
+  "empty.folder": "Pasta vazia",
+  "loading": "Carregando…",
+  "col.name": "Nome",
+  "col.size": "Tamanho",
+  "col.modified": "Modificado",
+  "transfers": "Transferências",
+  "transfers.count": "{n} transferência",
+  "transfers.count_plural": "{n} transferências",
+  "transfer.queued": "Na fila",
+  "transfer.done": "Concluído",
+  "transfer.failed": "Falhou",
+  "transfer.cancelled": "Cancelado",
+  "transfer.dl": "DL",
+  "transfer.up": "UP",
+  "ctx.delete": "Excluir…",
+  "confirm.delete": "Excluir {label}?",
+  "confirm.delete_items": "Excluir {n} itens?",
+  "confirm.delete_btn": "Excluir",
+  "confirm.cancel_btn": "Cancelar",
+  "confirm.ok_btn": "OK",
+  "items.count": "{n} item",
+  "items.count_plural": "{n} itens",
+  "status.active": "{n} ativo · {speed}",
+  "status.connected": "Conectado  {name}",
+  "status.disconnected": "Switch desconectada",
+  "status.listing_error": "Erro ao listar: {error}",
+  "status.downloading": "Baixando  {name}",
+  "status.uploading": "Enviando  {name}",
+  "menu.options": "Opções",
+  "menu.language": "Idioma",
+  "menu.language_system": "Padrão do sistema",
+  "menu.quit": "Sair do OmniMTP",
+  "menu.about": "Sobre o OmniMTP",
+  "about.tagline": "Cliente MTP Nintendo Switch para macOS",
+  "about.version": "Versão {version}",
+  "about.copyright": "Copyright © 2026 NiklasCFW"
+}