feat(ui): Words / QR code tabs on LND seed reveal + onboarding seed

Both seed screens get the wallet-settings segmented tab style: words
stay the default first view; the QR tab renders the space-joined seed
words for wallets that support seed import by scan. The LND reveal QR
sits behind the same tap-to-reveal blur as the words, and both panes
warn that the code is equivalent to the words.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/views/OnboardingSeedGenerate.vue

@@ -44,7 +44,19 @@
 
           <!-- Word Grid -->
           <div v-if="words.length > 0" class="w-full max-w-[600px]">
-            <div class="grid grid-cols-2 sm:grid-cols-4 gap-1 sm:gap-1.5">
+            <!-- Words / QR tabs — words first; QR for wallets that import by scan -->
+            <div class="flex gap-1 mb-2 p-1 bg-white/5 rounded-lg">
+              <button
+                v-for="tab in ([{ key: 'words', label: 'Words' }, { key: 'qr', label: 'QR code' }] as const)"
+                :key="tab.key"
+                type="button"
+                @click="seedTab = tab.key"
+                class="flex-1 px-2 py-1.5 rounded text-xs font-medium transition-colors"
+                :class="seedTab === tab.key ? 'bg-white/15 text-white' : 'text-white/50 hover:text-white/80'"
+              >{{ tab.label }}</button>
+            </div>
+
+            <div v-if="seedTab === 'words'" class="grid grid-cols-2 sm:grid-cols-4 gap-1 sm:gap-1.5">
               <div
                 v-for="(word, i) in words"
                 :key="i"
@@ -55,6 +67,14 @@
               </div>
             </div>
 
+            <div v-else class="flex flex-col items-center gap-2 py-2">
+              <canvas ref="seedQrCanvas" class="rounded-lg bg-white p-2"></canvas>
+              <p class="text-xs text-white/50 text-center max-w-[420px]">
+                The code contains your seed words — scan only into a wallet you trust,
+                and treat it exactly like the words themselves.
+              </p>
+            </div>
+
             <!-- Warning -->
             <div class="mt-3 bg-orange-500/10 border border-orange-500/20 rounded-lg px-3 py-2.5">
               <p class="text-xs sm:text-sm text-orange-300/90">
@@ -99,6 +119,19 @@ import { playNavSound } from '@/composables/useNavSounds'
 const router = useRouter()
 const continueButton = ref<HTMLButtonElement | null>(null)
 const words = ref<string[]>([])
+
+// Words / QR code view of the seed — words are the default first view.
+const seedTab = ref<'words' | 'qr'>('words')
+const seedQrCanvas = ref<HTMLCanvasElement | null>(null)
+watch(seedTab, async (tab) => {
+  if (tab !== 'qr') return
+  await nextTick()
+  if (!seedQrCanvas.value || words.value.length === 0) return
+  try {
+    const QRCode = await import('qrcode')
+    await QRCode.toCanvas(seedQrCanvas.value, words.value.join(' '), { width: 240, margin: 1 })
+  } catch { /* QR is a convenience — the words remain authoritative */ }
+})
 const confirmed = ref(false)
 const loading = ref(false)
 const waitingForServer = ref(false)

neode-ui/src/views/appDetails/LndSeedBackup.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, onMounted } from 'vue'
+import { ref, watch, nextTick, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { rpcClient } from '@/api/rpc-client'
 
@@ -65,9 +65,25 @@ function openReveal() {
   revealError.value = ''
   revealedWords.value = []
   wordsHidden.value = true
+  seedTab.value = 'words' // words first — QR is the opt-in second view
   showRevealModal.value = true
 }
 
+// Words / QR code tabs (wallet-settings segmented style). The QR encodes the
+// space-joined seed words for wallets that support seed import by scan.
+const seedTab = ref<'words' | 'qr'>('words')
+const seedQrCanvas = ref<HTMLCanvasElement | null>(null)
+
+async function renderSeedQr() {
+  await nextTick()
+  if (!seedQrCanvas.value || revealedWords.value.length === 0) return
+  try {
+    const QRCode = await import('qrcode')
+    await QRCode.toCanvas(seedQrCanvas.value, revealedWords.value.join(' '), { width: 260, margin: 1 })
+  } catch { /* QR is a convenience — the words remain authoritative */ }
+}
+watch(seedTab, (t) => { if (t === 'qr') void renderSeedQr() })
+
 async function submitReveal() {
   if (revealing.value || !revealPassword.value) return
   revealing.value = true
@@ -166,6 +182,18 @@ async function confirmBackedUp() {
         </template>
 
         <template v-else>
+          <div class="flex gap-1 mb-3 p-1 bg-white/5 rounded-lg">
+            <button
+              v-for="tab in ([{ key: 'words', label: 'Words' }, { key: 'qr', label: 'QR code' }] as const)"
+              :key="tab.key"
+              type="button"
+              @click="seedTab = tab.key"
+              class="flex-1 px-2 py-1.5 rounded text-xs font-medium transition-colors"
+              :class="seedTab === tab.key ? 'bg-white/15 text-white' : 'text-white/50 hover:text-white/80'"
+            >{{ tab.label }}</button>
+          </div>
+
+          <template v-if="seedTab === 'words'">
             <p class="text-sm text-white/60 mb-3">Write these down and store them offline. Tap to {{ wordsHidden ? 'reveal' : 'hide' }}.</p>
             <div class="relative">
               <div
@@ -180,6 +208,23 @@ async function confirmBackedUp() {
               </div>
               <button v-if="wordsHidden" type="button" class="absolute inset-0 flex items-center justify-center text-xs text-white/70 font-medium" @click="wordsHidden = false">Tap to reveal</button>
             </div>
+          </template>
+
+          <template v-else>
+            <p class="text-sm text-white/60 mb-3">Scan with a wallet that supports seed import by QR. Tap to {{ wordsHidden ? 'reveal' : 'hide' }}.</p>
+            <div class="relative">
+              <div
+                class="flex justify-center p-3 bg-white/5 rounded-lg transition-all"
+                :class="wordsHidden ? 'blur-md' : ''"
+                @click="wordsHidden = !wordsHidden"
+              >
+                <canvas ref="seedQrCanvas" class="rounded-lg bg-white p-2"></canvas>
+              </div>
+              <button v-if="wordsHidden" type="button" class="absolute inset-0 flex items-center justify-center text-xs text-white/70 font-medium" @click="wordsHidden = false">Tap to reveal</button>
+            </div>
+            <p class="text-xs text-white/40 mt-2">The code contains your seed words — treat it exactly like the words themselves.</p>
+          </template>
+
           <div class="flex gap-2 pt-4">
             <button type="button" @click="copyRevealedWords" class="flex-1 glass-button rounded-lg px-4 py-2 text-sm font-medium">{{ wordsCopied ? 'Copied!' : 'Copy' }}</button>
             <button type="button" :disabled="acking" @click="confirmBackedUp" class="flex-1 glass-button rounded-lg px-4 py-2 text-sm font-medium bg-orange-500/20 border-orange-400/30 disabled:opacity-50">