fix(test): champ structured manquant dans LaunchAgentOutput (build D3 cassé)

Le commit D3 (56913b9) a ajouté le champ structured: Option<...> à
LaunchAgentOutput mais a laissé deux constructions de test sans ce champ,
cassant la compilation du crate de test app-tauri (E0063). Ajoute
structured: None aux deux. Suite workspace de nouveau verte (775/0).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/app-tauri/tests/dto_agents.rs

@@ -307,6 +307,7 @@ fn launch_agent_output_maps_to_terminal_session_dto() {
     let out = LaunchAgentOutput {
         session,
         assigned_conversation_id: None,
+        structured: None,
     };
     let dto = TerminalSessionDto::from(out);
 
@@ -350,6 +351,7 @@ fn launch_agent_output_propagates_assigned_conversation_id() {
     let out = LaunchAgentOutput {
         session,
         assigned_conversation_id: Some("conv-xyz".to_owned()),
+        structured: None,
     };
     let dto = TerminalSessionDto::from(out);