feat: add comment support for Lightning payments in BTCPay and Strike services

- Enhanced the sendPaymentWithAddress method in BTCPayService and StrikeService to accept an optional comment parameter.
- Updated resolveLightningAddress to include the comment in the callback URL if supported by the LNURL-pay endpoint.
- Modified PaymentService to construct a descriptive comment for Lightning invoices, improving clarity for users.

These changes enhance the payment experience by allowing users to include contextual information with their transactions.

src/stores/auth.ts

@@ -20,17 +20,18 @@ function isConnectionError(error: any): boolean {
 /** Build a mock Nostr user with filmmaker profile + subscription */
 function buildMockNostrUser(pubkey: string) {
   const mockUserId = 'mock-nostr-user-' + pubkey.slice(0, 8)
+  const shortPub = pubkey.slice(0, 8)
   return {
     id: mockUserId,
-    email: `${pubkey.slice(0, 8)}@nostr.local`,
-    legalName: 'Nostr User',
+    email: `${shortPub}@nostr.local`,
+    legalName: `npub...${pubkey.slice(-6)}`,
     nostrPubkey: pubkey,
     createdAt: new Date().toISOString(),
     updatedAt: new Date().toISOString(),
     filmmaker: {
-      id: 'mock-filmmaker-' + pubkey.slice(0, 8),
+      id: 'mock-filmmaker-' + shortPub,
       userId: mockUserId,
-      professionalName: 'Nostr Filmmaker',
+      professionalName: `npub...${pubkey.slice(-6)}`,
       bio: 'Independent filmmaker and content creator.',
     },
     subscriptions: [{