feat: confirmation-aware TX verification (10-conf threshold)

- 0-9 confs: show amber 'Pending/N/10' stamp on QR, auto-poll every 60s
- ≥10 confs: show green 'Paid' stamp (Monero standard lock)
- verify.php: store status ('pending'|'paid'), allow upward updates
- i18n: add status_pending + proof_confirmed_pending (all 7 langs)
- style.css: add .proof-result.warning, .pending-stamp, .qr-container.confirming
- Polling stops on resetForm; short-URL viewers also poll verify.php

style.css

@@ -556,6 +556,12 @@ textarea {
   border: 1px solid var(--error);
 }
 
+.proof-result.warning {
+  background: rgba(245, 158, 11, 0.15);
+  color: #f59e0b;
+  border: 1px solid #f59e0b;
+}
+
 .payment-status {
   display: none;
 }
@@ -564,6 +570,10 @@ textarea {
   display: block;
 }
 
+.payment-status.pending {
+  display: block;
+}
+
 .paid-stamp {
   position: absolute;
   top: 50%;
@@ -587,6 +597,16 @@ textarea {
   opacity: 0.3;
 }
 
+.pending-stamp {
+  border-color: #f59e0b;
+  color: #f59e0b;
+}
+
+.qr-container.confirming canvas,
+.qr-container.confirming img {
+  opacity: 0.5;
+}
+
 .qr-container {
   position: relative;
 }