feat(layout): supporte la création de layouts plugins (customPluginLayout)

Étend le flux de création de layout backend (DTO, usecases, store) et le
frontend (sélecteur, adaptateurs, LayoutTabs/LayoutGrid) pour permettre
d'ouvrir un layout déclaré par un plugin installé (ex. Android Health),
sans passer par le message bloquant "extension backend pas encore livrée".

Ticket #141 — QA vert.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

crates/app-tauri/tests/dto_layouts.rs

@@ -10,8 +10,10 @@ use app_tauri_lib::dto::{
 };
 use application::{
     CreateLayoutOutput, DeleteLayoutOutput, LayoutInfo, LayoutKind, ListLayoutsOutput,
+    PluginLayoutOrigin,
 };
 use domain::ids::{AgentId, LayoutId, NodeId};
+use domain::{PluginId, PluginLayoutType};
 use serde_json::json;
 use uuid::Uuid;
 
@@ -55,6 +57,24 @@ fn layout_info_dto_git_graph_kind() {
     assert_eq!(v["kind"], "gitGraph");
 }
 
+#[test]
+fn layout_info_dto_plugin_kind() {
+    let info = LayoutInfo {
+        id: lid(3),
+        name: "Android Health".to_owned(),
+        kind: LayoutKind::Plugin {
+            plugin_origin: PluginLayoutOrigin {
+                plugin_id: PluginId::new("dev.idea.android-plugin").unwrap(),
+                layout_type: PluginLayoutType::new("idea-android.health").unwrap(),
+            },
+            state: json!({}),
+        },
+    };
+    let dto = LayoutInfoDto::from(info);
+    let v = serde_json::to_value(&dto).unwrap();
+    assert_eq!(v["kind"], "plugin");
+}
+
 // ---------------------------------------------------------------------------
 // ListLayoutsDto
 // ---------------------------------------------------------------------------
@@ -138,6 +158,43 @@ fn create_layout_request_with_git_graph_kind() {
     assert_eq!(kind, application::LayoutKind::GitGraph);
 }
 
+#[test]
+fn create_layout_request_with_plugin_kind() {
+    let project_id = Uuid::from_u128(13).to_string();
+    let raw = json!({
+        "projectId": project_id,
+        "name": "Android Health",
+        "kind": "plugin",
+        "pluginOrigin": {
+            "pluginId": "dev.idea.android-plugin",
+            "layoutType": "idea-android.health"
+        },
+        "state": { "deviceId": "pixel-8" }
+    });
+    let dto: CreateLayoutRequestDto = serde_json::from_value(raw).unwrap();
+    let kind = dto.parse_kind().unwrap();
+    match kind {
+        application::LayoutKind::Plugin {
+            plugin_origin,
+            state,
+        } => {
+            assert_eq!(plugin_origin.plugin_id.as_str(), "dev.idea.android-plugin");
+            assert_eq!(plugin_origin.layout_type.as_str(), "idea-android.health");
+            assert_eq!(state["deviceId"], "pixel-8");
+        }
+        _ => panic!("expected plugin layout kind"),
+    }
+}
+
+#[test]
+fn create_layout_request_plugin_kind_requires_origin() {
+    let project_id = Uuid::from_u128(14).to_string();
+    let raw = json!({ "projectId": project_id, "name": "Android Health", "kind": "plugin" });
+    let dto: CreateLayoutRequestDto = serde_json::from_value(raw).unwrap();
+    let err = dto.parse_kind().unwrap_err();
+    assert_eq!(err.code, "INVALID");
+}
+
 #[test]
 fn create_layout_request_unknown_kind_is_invalid() {
     let project_id = Uuid::from_u128(12).to_string();
@@ -260,6 +317,30 @@ fn set_cell_agent_op_deserialises_with_absent_agent_defaults_to_none() {
     }
 }
 
+// ---------------------------------------------------------------------------
+// setPluginLayoutState operation deserialisation (#141)
+// ---------------------------------------------------------------------------
+
+#[test]
+fn set_plugin_layout_state_op_deserialises_opaque_state() {
+    let target = nid(3);
+    let raw = json!({
+        "type": "setPluginLayoutState",
+        "target": target.to_string(),
+        "state": { "deviceId": "pixel-8", "healthy": true }
+    });
+    let dto: LayoutOperationDto = serde_json::from_value(raw).unwrap();
+    let op = dto.into_operation().unwrap();
+    match op {
+        application::LayoutOperation::SetPluginLayoutState { target: t, state } => {
+            assert_eq!(t, target);
+            assert_eq!(state["deviceId"], "pixel-8");
+            assert_eq!(state["healthy"], true);
+        }
+        _ => panic!("expected SetPluginLayoutState"),
+    }
+}
+
 // ---------------------------------------------------------------------------
 // setCellConversation operation deserialisation (T4b)
 // ---------------------------------------------------------------------------