feat(machine): render QR-pairing wizard for unpaired machines

Wires the capture + ingest pieces into a screen (aiolabs/bitspire#52). When
the machine boots `unpaired` (fresh, or binding revoked/expired) and runs
under Electron, App.vue renders `PairingWizard` in place of the static
"Pairing Required" card.

The wizard probes available sources, shows the camera viewfinder, and on a
valid scan persists + relaunches. A stray/non-seed QR is rejected with a hint
and scanning resumes. NFC (when present) appears as an alternate source
button. Browser dev (no Electron bridge) still falls back to the static card.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/machine/src/App.vue

@@ -8,6 +8,7 @@ import { classifyInitError } from '@/services/init-error'
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
 import { Sun, Moon } from 'lucide-vue-next'
+import PairingWizard from '@/components/PairingWizard.vue'
 
 const atmStore = useAtmStore()
 const route = useRoute()
@@ -61,6 +62,14 @@ const isKnownMaintenanceScreen = computed(
   () => !!atmStore.initError && atmStore.initError in MAINTENANCE_SCREENS
 )
 
+/**
+ * `unpaired` is interactive, not a dead-end: render the QR-pairing wizard so
+ * the operator can scan a spire-seed on-machine (aiolabs/bitspire#52). The
+ * wizard only works under Electron (needs the seed-persist + relaunch bridge);
+ * in browser dev it falls back to the static card.
+ */
+const showPairingWizard = computed(() => atmStore.initError === 'unpaired' && isElectron)
+
 const formattedBtcPrice = computed(() => {
   if (atmStore.btcPrice === null) return null
   const local = `${atmStore.fiatCode}/BTC: ${atmStore.fiatSymbol}${Math.round(atmStore.btcPrice).toLocaleString()}`
@@ -160,9 +169,12 @@ function toggleLiveServices() {
   <div
     class="flex min-h-dvh lg:h-dvh w-screen flex-col overflow-y-auto lg:overflow-hidden bg-background font-sans text-foreground"
   >
+    <!-- Unpaired: interactive QR-pairing wizard (aiolabs/bitspire#52) -->
+    <PairingWizard v-if="showPairingWizard" />
+
     <!-- Maintenance screen: shown when initialization fails in production -->
     <div
-      v-if="atmStore.initError"
+      v-else-if="atmStore.initError"
       class="flex flex-1 flex-col items-center justify-center gap-6 p-8"
     >
       <svg

apps/machine/src/components/PairingWizard.vue

@@ -0,0 +1,160 @@
+<script setup lang="ts">
+/**
+ * QR-pairing wizard (aiolabs/bitspire#52).
+ *
+ * Shown in place of the "Pairing Required" maintenance screen when the machine
+ * is unpaired. The operator displays the spire-seed QR (minted by spirekeeper)
+ * to the machine's camera; we decode it, persist it as VITE_SPIRE_SEED, and
+ * relaunch so the normal boot path performs the bunker pairing.
+ *
+ * Capture is abstracted behind PairingSource, so NFC (or a HAL scanner) can be
+ * offered later without changing this view.
+ */
+import { onMounted, onUnmounted, ref, shallowRef } from 'vue'
+import {
+  availablePairingSources,
+  ingestScannedSeed,
+  type PairingSource,
+  type StopCapture,
+} from '@/services/pairing'
+
+type Phase = 'probing' | 'scanning' | 'no-source' | 'pairing' | 'error'
+
+const phase = ref<Phase>('probing')
+const errorMessage = ref('')
+const videoEl = ref<HTMLVideoElement | null>(null)
+
+const sources = shallowRef<PairingSource[]>([])
+const activeSource = shallowRef<PairingSource | null>(null)
+let stopCapture: StopCapture | null = null
+
+async function startWith(source: PairingSource) {
+  await teardown()
+  activeSource.value = source
+  errorMessage.value = ''
+  phase.value = 'scanning'
+  try {
+    stopCapture = await source.start({
+      video: source.kind === 'qr' ? (videoEl.value ?? undefined) : undefined,
+      onScan: handleScan,
+      onError: (e) => console.warn('[Pairing] capture glitch:', e),
+    })
+  } catch (e) {
+    phase.value = 'error'
+    errorMessage.value =
+      e instanceof Error ? e.message : 'Could not start the camera. Check permissions.'
+  }
+}
+
+let handling = false
+async function handleScan(raw: string) {
+  if (handling) return
+  handling = true
+  const result = await ingestScannedSeed(raw)
+  if (result.ok) {
+    // saveSpireSeed succeeded; relaunch is in flight — hold a friendly screen.
+    phase.value = 'pairing'
+    return
+  }
+  // Reject non-seed scans (a stray QR) and resume scanning.
+  console.warn('[Pairing] rejected scan:', result.reason, result.message)
+  errorMessage.value =
+    result.reason === 'invalid-seed'
+      ? 'That code is not a pairing code. Show the operator pairing QR.'
+      : result.message
+  handling = false
+  if (activeSource.value) await startWith(activeSource.value)
+}
+
+async function teardown() {
+  if (stopCapture) {
+    try {
+      stopCapture()
+    } catch {
+      /* idempotent */
+    }
+    stopCapture = null
+  }
+}
+
+onMounted(async () => {
+  const available = await availablePairingSources()
+  sources.value = available
+  const first = available[0]
+  if (!first) {
+    phase.value = 'no-source'
+    return
+  }
+  await startWith(first)
+})
+
+onUnmounted(teardown)
+</script>
+
+<template>
+  <div class="flex flex-1 flex-col items-center justify-center gap-6 p-8">
+    <h1 class="text-2xl lg:text-[3.5rem] font-bold">Pair This Machine</h1>
+
+    <!-- Camera viewfinder -->
+    <div
+      v-show="phase === 'scanning' && activeSource?.kind === 'qr'"
+      class="relative overflow-hidden rounded-2xl border-4 border-primary/40 bg-black"
+      style="width: min(80vw, 28rem); aspect-ratio: 1 / 1"
+    >
+      <video ref="videoEl" class="h-full w-full object-cover" muted autoplay playsinline></video>
+      <!-- Reticle -->
+      <div class="pointer-events-none absolute inset-6 rounded-xl border-2 border-white/70"></div>
+    </div>
+
+    <p
+      v-if="phase === 'scanning'"
+      class="max-w-md text-center text-base lg:text-2xl text-muted-foreground"
+    >
+      Hold the operator's pairing QR up to the camera.
+    </p>
+
+    <p v-if="phase === 'probing'" class="text-base lg:text-2xl text-muted-foreground">
+      Starting camera…
+    </p>
+
+    <div v-if="phase === 'pairing'" class="flex flex-col items-center gap-4">
+      <p class="text-base lg:text-2xl text-muted-foreground">Pairing accepted — restarting…</p>
+    </div>
+
+    <p
+      v-if="phase === 'no-source'"
+      class="max-w-md text-center text-base lg:text-2xl text-muted-foreground"
+    >
+      No camera or NFC reader is available on this machine. Pair by provisioning
+      <span class="font-mono">VITE_SPIRE_SEED</span> instead.
+    </p>
+
+    <p
+      v-if="phase === 'error'"
+      class="max-w-md text-center text-base lg:text-xl text-destructive"
+    >
+      {{ errorMessage }}
+    </p>
+
+    <!-- Transient rejected-scan hint while still scanning -->
+    <p
+      v-if="phase === 'scanning' && errorMessage"
+      class="max-w-md text-center text-sm lg:text-base text-warning"
+    >
+      {{ errorMessage }}
+    </p>
+
+    <!-- Alternate sources (e.g. NFC) when more than one is available -->
+    <div v-if="sources.length > 1" class="flex gap-3">
+      <button
+        v-for="source in sources"
+        :key="source.kind"
+        class="rounded-lg border border-border px-4 py-2 text-sm"
+        :class="activeSource?.kind === source.kind ? 'bg-primary text-primary-foreground' : ''"
+        @click="startWith(source)"
+      >
+        {{ source.label }}
+      </button>
+    </div>
+  </div>
+</template>