Archipelago — open-source initial import

neode-ui/src/utils/seedqr.ts

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+/**
+ * SeedQR encoding (SeedSigner standard, supported by Passport/Passport Prime,
+ * SeedSigner, Keystone, Nunchuk, Sparrow, …): each BIP39 word becomes its
+ * zero-padded 4-digit wordlist index (0000–2047), concatenated into one
+ * digit stream and rendered as a numeric-mode QR. A 24-word seed is 96
+ * digits. Spec: github.com/SeedSigner/seedsigner/blob/main/docs/seed_qr
+ *
+ * Only valid for real BIP39 mnemonics — LND's aezeed shares the wordlist but
+ * is NOT BIP39, and hardware wallets cannot import it; never SeedQR-encode it.
+ */
+export async function toSeedQrDigits(words: string[]): Promise<string | null> {
+  if (words.length === 0) return null
+  const { wordlist } = await import('@scure/bip39/wordlists/english.js')
+  const digits: string[] = []
+  for (const raw of words) {
+    const idx = wordlist.indexOf(raw.trim().toLowerCase())
+    if (idx < 0) return null // not a BIP39 word — caller falls back to text
+    digits.push(idx.toString().padStart(4, '0'))
+  }
+  return digits.join('')
+}