Implement payment request normalization in SendDialog

- Added a new function to normalize payment requests by stripping URI prefixes (lightning: and lnurl:) and handling BIP-21 Bitcoin URIs with Lightning fallback.
- Updated the destination parsing logic to utilize the normalization function, ensuring consistent handling of various payment formats.
- Enhanced the payment submission process by using the normalized destination for sending payments.

These changes improve the robustness of payment handling in the SendDialog, providing better support for different payment request formats.

src/modules/wallet/components/SendDialog.vue

@@ -93,6 +93,30 @@ function parseBolt11Invoice(bolt11: string): ParsedInvoice | null {
   }
 }
 
+function normalizePaymentRequest(request: string): string {
+  let normalized = request.trim()
+  const req = normalized.toLowerCase()
+
+  // Handle Lightning URI prefix stripping (following LNbits implementation)
+  if (req.startsWith('lightning:')) {
+    normalized = normalized.slice(10) // Remove "lightning:" (10 chars)
+  } else if (req.startsWith('lnurl:')) {
+    normalized = normalized.slice(6) // Remove "lnurl:" (6 chars)
+  } else if (req.includes('lightning=lnurl1')) {
+    // Extract LNURL from lightning parameter
+    normalized = normalized.split('lightning=')[1].split('&')[0]
+  } else if (req.includes('lightning=')) {
+    // Handle BIP-21 Bitcoin URIs with Lightning fallback
+    normalized = normalized.split('lightning=')[1]
+    // Remove any additional query parameters
+    if (normalized.includes('&')) {
+      normalized = normalized.split('&')[0]
+    }
+  }
+
+  return normalized.trim()
+}
+
 function parsePaymentDestination(destination: string) {
   // Clear previous parsing results
   parsedInvoice.value = null
@@ -101,7 +125,8 @@ function parsePaymentDestination(destination: string) {
 
   if (!destination.trim()) return
 
-  const cleanDest = destination.trim()
+  // Normalize the destination by stripping URI prefixes
+  const cleanDest = normalizePaymentRequest(destination)
 
   if (isBolt11(cleanDest)) {
     paymentType.value = 'bolt11'
@@ -198,8 +223,11 @@ const effectiveAmount = computed(() => {
 // Methods
 const onSubmit = form.handleSubmit(async (formValues) => {
   try {
+    // Use normalized destination (stripped of URI prefixes)
+    const normalizedDestination = normalizePaymentRequest(formValues.destination)
+
     const success = await walletService.sendPayment({
-      destination: formValues.destination,
+      destination: normalizedDestination,
       amount: effectiveAmount.value, // Use computed effective amount
       comment: formValues.comment || undefined
     })