fix(layout): auto-réparer l'onglet actif

stale

Le backend renvoie l'id actif autoritaire et le
    frontend l'adopte pour éviter de rejouer un layout
    disparu après overwrite externe.

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

crates/app-tauri/src/commands.rs

@@ -19,12 +19,11 @@ use application::{
     ListResumableAgentsInput, ListSkillsInput, LiveSessions, LoadLayoutInput, McpRuntime,
     MutateLayoutInput, OpenProjectInput, ReadAgentContextInput, ReadConversationPageInput,
     ReadMemoryIndexInput, ReadProjectContextInput, RecallMemoryInput, ReconcileLayoutsInput,
-    ReconcileLiveStateInput,
-    RenameLayoutInput, ResolveAgentPermissionsInput, ResolveMemoryLinksInput,
-    RotateConversationLogInput, SetActiveLayoutInput, SnapshotRunningAgentsInput,
-    StopLiveAgentInput, SyncAgentWithTemplateInput, UnassignSkillFromAgentInput,
-    UpdateAgentContextInput, UpdateAgentPermissionsInput, UpdateMemoryInput,
-    UpdateProjectContextInput, UpdateProjectPermissionsInput, UpdateSkillInput,
+    ReconcileLiveStateInput, RenameLayoutInput, ResolveAgentPermissionsInput,
+    ResolveMemoryLinksInput, RotateConversationLogInput, SetActiveLayoutInput,
+    SnapshotRunningAgentsInput, StopLiveAgentInput, SyncAgentWithTemplateInput,
+    UnassignSkillFromAgentInput, UpdateAgentContextInput, UpdateAgentPermissionsInput,
+    UpdateMemoryInput, UpdateProjectContextInput, UpdateProjectPermissionsInput, UpdateSkillInput,
 };
 use domain::ports::PtyHandle;
 
@@ -49,13 +48,13 @@ use crate::dto::{
     ReadConversationPageRequestDto, ReattachChatDto, ReattachResultDto, RecallMemoryRequestDto,
     RenameLayoutRequestDto, ReplyChunk, ResizeTerminalRequestDto,
     ResolveAgentPermissionsRequestDto, ResumableAgentListDto, SaveEmbedderProfileRequestDto,
-    SaveProfileRequestDto, SetActiveLayoutRequestDto, SkillDto, SkillListDto,
-    StopLiveAgentRequestDto, StopLiveAgentResponseDto, SyncAgentWithTemplateRequestDto,
-    SyncResultDto, TemplateDto, TemplateListDto, TerminalClosedDto, TerminalSessionDto,
-    TurnPageDto, UnassignSkillRequestDto, UpdateAgentContextRequestDto,
-    UpdateAgentPermissionsRequestDto, UpdateMemoryRequestDto, UpdateProjectContextRequestDto,
-    UpdateProjectPermissionsRequestDto, UpdateSkillRequestDto, UpdateTemplateRequestDto,
-    WriteTerminalRequestDto,
+    SaveProfileRequestDto, SetActiveLayoutRequestDto, SetActiveLayoutResultDto, SkillDto,
+    SkillListDto, StopLiveAgentRequestDto, StopLiveAgentResponseDto,
+    SyncAgentWithTemplateRequestDto, SyncResultDto, TemplateDto, TemplateListDto,
+    TerminalClosedDto, TerminalSessionDto, TurnPageDto, UnassignSkillRequestDto,
+    UpdateAgentContextRequestDto, UpdateAgentPermissionsRequestDto, UpdateMemoryRequestDto,
+    UpdateProjectContextRequestDto, UpdateProjectPermissionsRequestDto, UpdateSkillRequestDto,
+    UpdateTemplateRequestDto, WriteTerminalRequestDto,
 };
 use crate::pty::{PtyBridge, PtyChunk};
 use crate::state::AppState;
@@ -678,14 +677,16 @@ pub async fn delete_layout(
 
 /// `set_active_layout` — switch the active named layout of a project.
 ///
+/// Self-healing: a stale `layout_id` does not error; the active layout is left
+/// unchanged and the actually-active id is returned (authoritative).
+///
 /// # Errors
-/// Returns an [`ErrorDto`] (`INVALID` for malformed id, `NOT_FOUND` if the
-/// project or layout is unknown).
+/// Returns an [`ErrorDto`] (`INVALID` for malformed id) or a persistence error.
 #[tauri::command]
 pub async fn set_active_layout(
     request: SetActiveLayoutRequestDto,
     state: State<'_, AppState>,
-) -> Result<(), ErrorDto> {
+) -> Result<SetActiveLayoutResultDto, ErrorDto> {
     let project_id = parse_project_id(&request.project_id)?;
     let layout_id = parse_layout_id(&request.layout_id)?;
     state
@@ -695,6 +696,7 @@ pub async fn set_active_layout(
             layout_id,
         })
         .await
+        .map(SetActiveLayoutResultDto::from)
         .map_err(ErrorDto::from)
 }
 

crates/app-tauri/src/dto.rs

@@ -390,7 +390,7 @@ pub fn parse_session_id(raw: &str) -> Result<SessionId, ErrorDto> {
 
 use application::{
     CreateLayoutOutput, DeleteLayoutOutput, LayoutInfo, LayoutOperation, ListLayoutsOutput,
-    LoadLayoutOutput, MutateLayoutOutput,
+    LoadLayoutOutput, MutateLayoutOutput, SetActiveLayoutOutput,
 };
 use domain::{AgentId, Direction, LayoutId, LayoutTree, NodeId};
 
@@ -700,6 +700,23 @@ pub struct DeleteLayoutRequestDto {
     pub layout_id: String,
 }
 
+/// Response DTO for `set_active_layout`.
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SetActiveLayoutResultDto {
+    /// The layout actually activated — equals the requested id when valid, else
+    /// the unchanged current active id (self-healing fallback). Authoritative.
+    pub active_id: String,
+}
+
+impl From<SetActiveLayoutOutput> for SetActiveLayoutResultDto {
+    fn from(out: SetActiveLayoutOutput) -> Self {
+        Self {
+            active_id: out.active_id.to_string(),
+        }
+    }
+}
+
 /// Request DTO for `set_active_layout`.
 #[derive(Debug, Clone, Deserialize)]
 #[serde(rename_all = "camelCase")]