fix(machine): hide cancel after bills inserted, kiosk-only UI cleanup

- Hide header cancel button after bills are in cash box
- Add spinning hourglass to displayingQR waiting indicator
- Hide keyboard-dependent UI in Electron kiosk mode:
  QR mode selector, manual payment options, copy buttons
  These remain available in browser (web-ui) mode.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/machine/src/views/CashInView.vue

@@ -13,6 +13,19 @@ import QRCode from '@/components/QRCode.vue'
 
 const router = useRouter()
 const atmStore = useAtmStore()
+const isElectron = typeof window !== 'undefined' && window.electronAPI !== undefined
+
+// Whether the header cancel button should be visible
+// Hide after bills are inserted — state machine routes to confirmAbandon instead
+const showCancelButton = computed(() => {
+  const state = atmStore.nestedState
+  const hasBills = (atmStore.context?.billsInserted.length ?? 0) > 0
+  // Always show in insertingBills (before bills) and error (without bills)
+  if (state === 'insertingBills' || state === 'fetchingRate') return true
+  if (state === 'error' && !hasBills) return true
+  // Hide when bills are in the cash box
+  return false
+})
 
 // CLINK Debit: customer's npub/pubkey
 const pubkeyInput = ref('')
@@ -190,7 +203,10 @@ const isProcessing = computed(() => atmStore.isPayingInvoice || atmStore.isReque
   <div class="flex min-h-0 flex-1 flex-col">
     <!-- Header -->
     <header class="flex items-center bg-black/30 px-4 pb-3 pt-12 sm:px-8 sm:py-4">
-      <Button variant="ghost" class="text-muted-foreground" @click="cancel">← Cancel</Button>
+      <Button v-if="showCancelButton" variant="ghost" class="text-muted-foreground" @click="cancel">
+        ← Cancel
+      </Button>
+      <div v-else class="w-20"></div>
       <h2 class="flex-1 text-center text-lg font-semibold sm:text-xl">Buy Bitcoin</h2>
       <div class="w-20"></div>
     </header>
@@ -312,8 +328,8 @@ const isProcessing = computed(() => atmStore.isPayingInvoice || atmStore.isReque
               </p>
             </div>
 
-            <!-- Scan with selector -->
-            <div class="text-center">
+            <!-- Scan with selector (web-ui only — kiosk users just scan) -->
+            <div v-if="!isElectron" class="text-center">
               <p class="text-xs text-muted-foreground mb-2">Scan with</p>
               <div class="flex flex-wrap gap-2 justify-center">
                 <Button
@@ -373,8 +389,14 @@ const isProcessing = computed(() => atmStore.isPayingInvoice || atmStore.isReque
               </div>
             </div>
 
-            <!-- Mode label + truncated URI -->
-            <div class="text-center space-y-1">
+            <!-- Waiting for payment indicator -->
+            <div v-if="currentQrValue" class="flex items-center justify-center gap-2">
+              <span class="animate-hourglass text-lg">⏳</span>
+              <p class="text-sm text-muted-foreground">Waiting for payment...</p>
+            </div>
+
+            <!-- Mode label + truncated URI (web-ui only) -->
+            <div v-if="!isElectron" class="text-center space-y-1">
               <p class="text-xs font-medium text-muted-foreground uppercase tracking-wide">
                 {{
                   qrMode === 'unified'
@@ -395,8 +417,8 @@ const isProcessing = computed(() => atmStore.isPayingInvoice || atmStore.isReque
               </div>
             </div>
 
-            <!-- Alternative: Manual Options (collapsed) -->
-            <details class="rounded-lg bg-white/5 p-3">
+            <!-- Alternative: Manual Options (web-ui only, no keyboard on kiosk) -->
+            <details v-if="!isElectron" class="rounded-lg bg-white/5 p-3">
               <summary class="cursor-pointer text-sm text-muted-foreground">
                 Alternative: Manual payment options
               </summary>

apps/machine/src/views/CashOutView.vue

@@ -12,6 +12,7 @@ import QRCode from '@/components/QRCode.vue'
 
 const router = useRouter()
 const atmStore = useAtmStore()
+const isElectron = typeof window !== 'undefined' && window.electronAPI !== undefined
 
 // Copy invoice functionality
 const copyButtonText = ref('Copy Invoice')
@@ -254,8 +255,8 @@ function formatFiat(cents: number): string {
               <p class="text-center text-muted-foreground">Waiting for payment...</p>
             </div>
 
-            <!-- Invoice info with copy button -->
-            <div v-if="context?.invoice" class="rounded-lg bg-white/5 p-3">
+            <!-- Invoice info with copy button (web-ui only) -->
+            <div v-if="context?.invoice && !isElectron" class="rounded-lg bg-white/5 p-3">
               <p class="mb-2 truncate text-center font-mono text-xs text-muted-foreground">
                 {{ context.invoice.slice(0, 50) }}...
               </p>