chore: remove Lamassu branding from ATM UI

Replace brand-specific text with generic "Bitcoin ATM" heading
and simplified thank you messages.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lamassu-next/apps/machine/src/views/CashInView.vue

@@ -349,7 +349,7 @@ const isProcessing = computed(() => atmStore.isPayingInvoice || atmStore.isReque
             You received
             <Badge variant="secondary">{{ formatSats(context.satsAmount) }} sats</Badge>
           </p>
-          <p class="text-muted-foreground">Thank you for using Lamassu</p>
+          <p class="text-muted-foreground">Thank you!</p>
         </CardContent>
       </Card>
 

lamassu-next/apps/machine/src/views/CashOutView.vue

@@ -304,7 +304,7 @@ function formatFiat(cents: number): string {
         <CardContent class="flex flex-col items-center gap-4 p-8 text-center">
           <div class="text-6xl">🎉</div>
           <CardTitle class="text-green-400">Transaction Complete!</CardTitle>
-          <p class="text-muted-foreground">Thank you for using Lamassu</p>
+          <p class="text-muted-foreground">Thank you!</p>
         </CardContent>
       </Card>
 

lamassu-next/apps/machine/src/views/IdleView.vue

@@ -34,8 +34,7 @@ function handleCashOut() {
   <div class="flex flex-1 flex-col items-center justify-center gap-12 p-8">
     <!-- Logo -->
     <div class="text-center">
-      <h1 class="text-5xl font-bold text-primary">⚡ Lamassu</h1>
+      <h1 class="text-5xl font-bold text-primary">⚡ Bitcoin ATM</h1>
-      <p class="mt-2 text-lg text-muted-foreground">Bitcoin ATM</p>
     </div>
 
     <!-- Action Buttons -->