fix(serverless): build ChannelInfo locally on create/open_dm (fixes 'nothing happened')

The serverless create_channel and open_dm re-queried the relay for the
kind:39000 they had just published, to build ChannelInfo. On a public relay
that immediate round-trip races against propagation/indexing lag and can
return empty, throwing 'metadata not yet available' — surfacing as a private
channel / DM that silently fails to appear in the UI.

Both now derive ChannelInfo directly from the locally-signed metadata event
(we created it, so is_member = true), with no relay round-trip and no race.

desktop/src-tauri/src/commands/channels.rs

@@ -363,10 +363,12 @@ pub async fn create_channel(
     if state.is_serverless() {
         // No relay to process a kind:9007 command — publish the kind:39000
         // metadata and a kind:39002 membership (self) directly so the channel
-        // is discoverable via get_channels.
-        let my_pubkey = {
+        // is discoverable via get_channels. Build ChannelInfo from the locally
+        // signed metadata event rather than re-querying the relay, which can
+        // race against propagation/indexing lag (the "nothing happened" bug).
+        let (my_pubkey, keys) = {
             let keys = state.keys.lock().map_err(|e| e.to_string())?;
-            keys.public_key().to_hex()
+            (keys.public_key().to_hex(), keys.clone())
         };
         let meta = events::build_channel_metadata_serverless(
             &channel_uuid_string,
@@ -376,9 +378,16 @@ pub async fn create_channel(
             description.as_deref(),
             &[],
         )?;
+        let meta_event = meta
+            .clone()
+            .sign_with_keys(&keys)
+            .map_err(|e| format!("failed to sign channel metadata: {e}"))?;
         submit_event(meta, &state).await?;
         let members = events::build_channel_members_serverless(&channel_uuid_string, &[my_pubkey])?;
         submit_event(members, &state).await?;
+        // Return ChannelInfo derived from the event we just published (member,
+        // since we created it). No relay round-trip required.
+        return nostr_convert::channel_info_from_event(&meta_event, None, Some(true));
     } else {
         let builder = events::build_create_channel(
             channel_uuid,

desktop/src-tauri/src/commands/dms.rs

@@ -36,10 +36,12 @@ pub async fn open_dm(
     let channel_id = if state.is_serverless() {
         // No relay to assign a channel id. Derive a deterministic id from the
         // sorted participant set (including self) so both sides converge on the
-        // same DM channel, then publish 39000 + 39002 directly.
-        let my_pubkey = {
+        // same DM channel, then publish 39000 + 39002 directly. Return
+        // ChannelInfo from the locally signed event rather than re-querying the
+        // relay (which races against propagation lag).
+        let (my_pubkey, keys) = {
             let keys = state.keys.lock().map_err(|e| e.to_string())?;
-            keys.public_key().to_hex()
+            (keys.public_key().to_hex(), keys.clone())
         };
         let mut participants: Vec<String> = pubkeys
             .iter()
@@ -59,11 +61,15 @@ pub async fn open_dm(
             None,
             &participants,
         )?;
+        let meta_event = meta
+            .clone()
+            .sign_with_keys(&keys)
+            .map_err(|e| format!("failed to sign DM metadata: {e}"))?;
         submit_event(meta, &state).await?;
         let members = events::build_channel_members_serverless(&channel_id, &participants)?;
         submit_event(members, &state).await?;
 
-        channel_id
+        return nostr_convert::channel_info_from_event(&meta_event, None, Some(true));
     } else {
         // Submit a kind:41010 dm-open event; the relay replies with the channel
         // id in its OK message payload.