feat: show DM relays in NIP-17 chat RelaysDropdown

- Added dmRelays field to ConversationMetadata type
- NIP-17 adapter now includes combined relays from both participants
- RelaysDropdown checks for dmRelays in addition to liveActivity/relayUrl

src/components/chat/RelaysDropdown.tsx

@@ -22,13 +22,17 @@ export function RelaysDropdown({ conversation }: RelaysDropdownProps) {
   const { relays: relayStates } = useRelayState();
 
   // Get relays for this conversation (immutable pattern)
+  // Priority: liveActivity relays > dmRelays > single relayUrl
   const liveActivityRelays = conversation.metadata?.liveActivity?.relays;
+  const dmRelays = conversation.metadata?.dmRelays;
   const relays: string[] =
     Array.isArray(liveActivityRelays) && liveActivityRelays.length > 0
       ? liveActivityRelays
-      : conversation.metadata?.relayUrl
-        ? [conversation.metadata.relayUrl]
-        : [];
+      : Array.isArray(dmRelays) && dmRelays.length > 0
+        ? dmRelays
+        : conversation.metadata?.relayUrl
+          ? [conversation.metadata.relayUrl]
+          : [];
 
   // Pre-compute normalized URLs and state lookups in a single pass (O(n))
   const relayData = relays.map((url) => {

src/lib/chat/adapters/nip-17-adapter.ts

@@ -163,11 +163,14 @@ export class Nip17Adapter extends ChatProtocolAdapter {
 
     // Fetch DM relays for both parties in parallel
     // (for self-chat, this fetches the same relays twice but that's fine)
-    await Promise.all([
+    const [ownRelays, partnerRelays] = await Promise.all([
       this.fetchDmRelays(activePubkey),
       this.fetchDmRelays(partnerPubkey),
     ]);
 
+    // Combine and deduplicate relays from both parties
+    const allRelays = [...new Set([...ownRelays, ...partnerRelays])];
+
     // Get display name for partner (the person we're chatting with)
     const metadataEvent = await this.getMetadata(partnerPubkey);
     const metadata = metadataEvent
@@ -187,6 +190,7 @@ export class Nip17Adapter extends ChatProtocolAdapter {
       metadata: {
         encrypted: true,
         giftWrapped: true,
+        dmRelays: allRelays,
       },
       unreadCount: 0,
     };

src/types/chat.ts

@@ -64,6 +64,7 @@ export interface ConversationMetadata {
   // NIP-17 DM
   encrypted?: boolean;
   giftWrapped?: boolean;
+  dmRelays?: string[]; // DM inbox relays for the conversation
 }
 
 /**