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, 7 insertions, 2 deletions

diff --git a/src/locales/mr.json b/src/locales/mr.json
index 2481153..4505c45 100644
--- a/src/locales/mr.json
+++ b/src/locales/mr.json
@@ -205,5 +205,10 @@
   "unlockSavedDesc": "या डिव्हाइसवर सेव्ह केलेली वॉलेट उघडण्यासाठी तुमचा पासवर्ड टाका.",
   "unlock": "अनलॉक करा",
   "useAnotherWallet": "दुसरे वॉलेट वापरा",
-  "save": "सेव्ह करा"
-}
+  "save": "सेव्ह करा",
+  "importLabel": "पुनर्प्राप्ती वाक्यांश किंवा की",
+  "importPlaceholder": "तुमचे 12 किंवा 24 शब्द, किंवा xpub / xprv",
+  "invalidImport": "हा वैध पुनर्प्राप्ती वाक्यांश, xpub किंवा xprv नाही.",
+  "importedKey": "आयात केलेली की",
+  "importedKeyNote": "हे वॉलेट विस्तारित खाजगी कीवरून आयात केले होते, त्यामुळे पुनर्प्राप्ती वाक्यांश नाही. वॉलेट टिकवण्यासाठी तीच की बॅकअप करा."
+}
\ No newline at end of file