agent page: inbox view of last 30 messages addressed to this agent

new wire request AgentRequest::Recent { limit } / ManagerRequest::Recent
(plus matching responses with Vec<InboxRow>). InboxRow moved to
hive-sh4re so it lives on both surfaces without an internal-to-wire
conversion. host-side dispatch in agent_server / manager_server
calls broker.recent_for(name, limit).

per-agent web_ui /api/state grew an inbox: Vec<InboxRow> populated
via the same per-agent socket (best-effort; transport failure
returns empty). frontend renders as a collapsible <details> section
between the state row and the terminal — fmt timestamp / from /
body in a tight grid, capped at 16em scrollable. only visible when
there are rows.

hive-ag3nt/src/web_ui.rs

@@ -124,6 +124,10 @@ struct StateSnapshot {
     status: &'static str,
     /// Present when `status == "needs_login_in_progress"`.
     session: Option<SessionView>,
+    /// Last N messages addressed to this agent, newest-first. Pulled
+    /// from the broker via the per-agent socket on each render.
+    /// Empty on transport failure.
+    inbox: Vec<hive_sh4re::InboxRow>,
 }
 
 #[derive(Serialize)]
@@ -157,14 +161,47 @@ async fn api_state(State(state): State<AppState>) -> axum::Json<StateSnapshot> {
         .ok()
         .and_then(|s| s.parse::<u16>().ok())
         .unwrap_or(7000);
+    let inbox = recent_inbox(&state.socket, state.flavor).await;
     axum::Json(StateSnapshot {
         label: state.label.clone(),
         dashboard_port,
         status,
         session: session_view,
+        inbox,
     })
 }
 
+/// Best-effort: pull the last 30 messages addressed to us via the
+/// per-agent / manager socket. Empty list on any transport / decode
+/// failure — the inbox section is decorative, not authoritative.
+async fn recent_inbox(socket: &std::path::Path, flavor: Flavor) -> Vec<hive_sh4re::InboxRow> {
+    const LIMIT: u64 = 30;
+    match flavor {
+        Flavor::Agent => {
+            match client::request::<_, hive_sh4re::AgentResponse>(
+                socket,
+                &hive_sh4re::AgentRequest::Recent { limit: LIMIT },
+            )
+            .await
+            {
+                Ok(hive_sh4re::AgentResponse::Recent { rows }) => rows,
+                _ => Vec::new(),
+            }
+        }
+        Flavor::Manager => {
+            match client::request::<_, hive_sh4re::ManagerResponse>(
+                socket,
+                &hive_sh4re::ManagerRequest::Recent { limit: LIMIT },
+            )
+            .await
+            {
+                Ok(hive_sh4re::ManagerResponse::Recent { rows }) => rows,
+                _ => Vec::new(),
+            }
+        }
+    }
+}
+
 // ---------------------------------------------------------------------------
 // Action handlers
 // ---------------------------------------------------------------------------