Fold watch-only into Import; support xprv spending import

Home screen is back to two tabs (Create / Import). The Import box now
takes a recovery phrase, an xpub/zpub, or an xprv/zprv:
- mnemonic → full wallet (as before)
- xpub/zpub → watch-only (view/receive, no Send)
- xprv/zprv → full spending wallet with no mnemonic. parseExtendedKey
  classifies + normalizes version bytes; account() derives the BIP84
  path from a master xprv (depth 0) or uses an account-level xprv as-is;
  signing works (only watch-only blocks it). Vault persists xprv accounts
  too; Settings shows an "Imported key" note instead of a recovery card
  and hides Nostr sync (no seed). Public-key export still works.

Note: a seed phrase cannot be derived from an xprv (one-way KDF), so an
xprv wallet has no recovery words by design. New strings in all 19 locales.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/locales/pt.json b/src/locales/pt.json
index fdb7828..83d5fb7 100644
--- a/src/locales/pt.json
+++ b/src/locales/pt.json
@@ -176,7 +176,6 @@
   "accounts": "Contas",
   "addWallet": "Adicionar carteira",
   "lockAll": "Bloquear tudo",
-  "remove": "Remover",
   "watchOnly": "Somente leitura",
   "watchOnlyTag": "somente leitura",
   "watchOnlyAdd": "Adicionar somente leitura",
@@ -206,5 +205,10 @@
   "unlockSavedDesc": "Digite sua senha para abrir as carteiras salvas neste dispositivo.",
   "unlock": "Desbloquear",
   "useAnotherWallet": "Usar outra carteira",
-  "save": "Salvar"
+  "save": "Salvar",
+  "importLabel": "Frase de recuperação ou chave",
+  "importPlaceholder": "Suas 12 ou 24 palavras, ou um xpub / xprv",
+  "invalidImport": "Isso não é uma frase de recuperação, xpub ou xprv válida.",
+  "importedKey": "Chave importada",
+  "importedKeyNote": "Esta carteira foi importada de uma chave privada estendida, então não há frase de recuperação. Faça backup dessa chave para manter a carteira."
 }
\ No newline at end of file