fix(relay): rustfmt + clippy for offline-mention tests

Address CI fmt-check and cloned_ref_to_slice_refs on #2296.

Signed-off-by: Bartok9 <danielrpike9@gmail.com>

Author: Bartok9

crates/buzz-relay/src/handlers/event.rs

@@ -2764,10 +2764,7 @@ mod tests {
                 nostr::Tag::parse(["p", &author]).unwrap(),
                 nostr::Tag::parse(["h", "00000000-0000-0000-0000-000000000001"]).unwrap(),
                 nostr::Tag::parse(["p", &offline_bot]).unwrap(),
-                nostr::Tag::custom(
-                    nostr::TagKind::Custom("mention".into()),
-                    [&offline_bot],
-                ),
+                nostr::Tag::custom(nostr::TagKind::Custom("mention".into()), [&offline_bot]),
             ]);
             assert_eq!(
                 crate::handlers::event::explicit_mention_pubkeys_from_tags(&intentional),
@@ -2780,9 +2777,7 @@ mod tests {
             let mentioned =
                 crate::handlers::event::explicit_mention_pubkeys_from_tags(&intentional);
             assert_eq!(
-                crate::handlers::event::select_offline_mentioned_bots(
-                    &mentioned, &bots, &present
-                ),
+                crate::handlers::event::select_offline_mentioned_bots(&mentioned, &bots, &present),
                 vec![offline_bot]
             );
         }
@@ -2801,15 +2796,15 @@ mod tests {
 
             // human p only → not selected (not bot)
             assert!(crate::handlers::event::select_offline_mentioned_bots(
-                &[human.clone()],
+                std::slice::from_ref(&human),
                 &bots,
                 &present
             )
             .is_empty());
 
             // online agent → no notice
             assert!(crate::handlers::event::select_offline_mentioned_bots(
-                &[online_bot.clone()],
+                std::slice::from_ref(&online_bot),
                 &bots,
                 &present
             )
@@ -2818,7 +2813,7 @@ mod tests {
             // offline agent → exactly one
             assert_eq!(
                 crate::handlers::event::select_offline_mentioned_bots(
-                    &[offline_bot.clone()],
+                    std::slice::from_ref(&offline_bot),
                     &bots,
                     &present
                 ),

crates/buzz-relay/src/workflow_sink.rs

@@ -296,11 +296,9 @@ impl ActionSink for RelayActionSink {
                     Tag::parse(["p", &mentioned])
                         .map_err(|e| ActionSinkError::EventBuild(format!("mention p tag: {e}")))?,
                 );
-                tags.push(
-                    Tag::parse(["mention", &mentioned]).map_err(|e| {
-                        ActionSinkError::EventBuild(format!("mention intent tag: {e}"))
-                    })?,
-                );
+                tags.push(Tag::parse(["mention", &mentioned]).map_err(|e| {
+                    ActionSinkError::EventBuild(format!("mention intent tag: {e}"))
+                })?);
             }
 
             let kind = Kind::from(KIND_STREAM_MESSAGE as u16);