fix: improve zap/nutzap rendering in chat

- Add mb-1 margin bottom to zap messages for spacing
- Show inline reply preview for zaps that target specific messages
- Fix nutzap amount extraction to handle multiple proof tags
- Extract replyTo from e-tag for nutzaps
- Pass nutzap event to RichText for custom emoji rendering

src/components/ChatViewer.tsx

@@ -181,9 +181,15 @@ const MessageItem = memo(function MessageItem({
   // Zap messages have special styling with gradient border
   if (message.type === "zap") {
     const zapRequest = message.event ? getZapRequest(message.event) : null;
+    // For NIP-57 zaps, reply target is in the zap request's e-tag
+    // For NIP-61 nutzaps, reply target is already in message.replyTo
+    const zapReplyTo =
+      message.replyTo ||
+      zapRequest?.tags.find((t) => t[0] === "e")?.[1] ||
+      undefined;
 
     return (
-      <div className="pl-2">
+      <div className="pl-2 mb-1">
         <div
           className="p-[1px]"
           style={{
@@ -213,11 +219,19 @@ const MessageItem = memo(function MessageItem({
                 <Timestamp timestamp={message.timestamp} />
               </span>
             </div>
+            {zapReplyTo && (
+              <ReplyPreview
+                replyToId={zapReplyTo}
+                adapter={adapter}
+                conversation={conversation}
+                onScrollToMessage={onScrollToMessage}
+              />
+            )}
             {message.content && (
               <RichText
                 content={message.content}
-                event={zapRequest || undefined}
-                className="mt-1 text-sm leading-tight break-words"
+                event={zapRequest || message.event}
+                className="text-sm leading-tight break-words"
                 options={{ showMedia: false, showEventEmbeds: false }}
               />
             )}

src/lib/chat/adapters/nip-29-adapter.ts

@@ -676,22 +676,29 @@ export class Nip29Adapter extends ChatProtocolAdapter {
     const pTag = event.tags.find((t) => t[0] === "p");
     const recipient = pTag?.[1] || "";
 
-    // Amount is sum of proof amounts from the proof tag
-    // proof tag format: ["proof", "<JSON proofs array>"]
-    const proofTag = event.tags.find((t) => t[0] === "proof");
+    // Reply target is the e-tag (the event being nutzapped)
+    const eTag = event.tags.find((t) => t[0] === "e");
+    const replyTo = eTag?.[1];
+
+    // Amount is sum of proof amounts from all proof tags
+    // NIP-61 allows multiple proof tags, each containing a JSON-encoded Cashu proof
     let amount = 0;
-    if (proofTag?.[1]) {
-      try {
-        const proofs = JSON.parse(proofTag[1]);
-        if (Array.isArray(proofs)) {
-          amount = proofs.reduce(
-            (sum: number, proof: { amount?: number }) =>
-              sum + (proof.amount || 0),
-            0,
-          );
+    for (const tag of event.tags) {
+      if (tag[0] === "proof" && tag[1]) {
+        try {
+          const proof = JSON.parse(tag[1]);
+          // Proof can be a single object or an array of proofs
+          if (Array.isArray(proof)) {
+            amount += proof.reduce(
+              (sum: number, p: { amount?: number }) => sum + (p.amount || 0),
+              0,
+            );
+          } else if (typeof proof === "object" && proof.amount) {
+            amount += proof.amount;
+          }
+        } catch {
+          // Invalid proof JSON, skip this tag
         }
-      } catch {
-        // Invalid proof JSON, amount stays 0
       }
     }
 
@@ -709,6 +716,7 @@ export class Nip29Adapter extends ChatProtocolAdapter {
       content: comment,
       timestamp: event.created_at,
       type: "zap", // Render the same as zaps
+      replyTo,
       protocol: "nip-29",
       metadata: {
         encrypted: false,