feat(settings): add favorite relays list (kind 10012) to relay settings

Add kind 10012 (Favorite Relays / Relay Feeds) to the settings UI and
account sync fetching. Uses "relay" tags like other NIP-51 lists.

https://claude.ai/code/session_01JHirYU56sKDKYhRx6aCQ54

src/components/settings/RelayListsSettings.tsx

@@ -72,6 +72,15 @@ const RELAY_LIST_KINDS: RelayListKindUIConfig[] = [
     tagName: "relay",
     hasMarkers: false,
   },
+  {
+    kind: 10012,
+    name: "Favorite Relays",
+    description:
+      "Relays you find interesting or want to browse. Can be used by clients for relay discovery and recommendations.",
+    nip: "51",
+    tagName: "relay",
+    hasMarkers: false,
+  },
   {
     kind: 10050,
     name: "DM Relays",
@@ -362,6 +371,10 @@ export function RelayListsSettings() {
     () => (pubkey ? eventStore.replaceable(10007, pubkey, "") : undefined),
     [pubkey],
   );
+  const event10012 = use$(
+    () => (pubkey ? eventStore.replaceable(10012, pubkey, "") : undefined),
+    [pubkey],
+  );
   const event10050 = use$(
     () => (pubkey ? eventStore.replaceable(10050, pubkey, "") : undefined),
     [pubkey],
@@ -372,9 +385,10 @@ export function RelayListsSettings() {
       10002: event10002,
       10006: event10006,
       10007: event10007,
+      10012: event10012,
       10050: event10050,
     }),
-    [event10002, event10006, event10007, event10050],
+    [event10002, event10006, event10007, event10012, event10050],
   );
 
   // Local draft state: kind -> entries

src/hooks/useAccountSync.ts

@@ -89,7 +89,7 @@ export function useAccountSync() {
     };
   }, [activeAccount?.pubkey, eventStore, setActiveAccountRelays]);
 
-  // Fetch other replaceable relay lists (10006, 10007, 10050) when account changes
+  // Fetch other replaceable relay lists when account changes
   // These are read directly from EventStore in the settings UI, we just need to trigger fetching
   useEffect(() => {
     if (!activeAccount?.pubkey) {
@@ -97,7 +97,7 @@ export function useAccountSync() {
     }
 
     const pubkey = activeAccount.pubkey;
-    const relayListKinds = [10006, 10007, 10050];
+    const relayListKinds = [10006, 10007, 10012, 10050];
 
     const subscriptions = relayListKinds.map((kind) =>
       addressLoader({ kind, pubkey, identifier: "" }).subscribe(),