fix(app-tauri,frontend): la fenêtre Tâches planifiées s'affiche en mode détaché — #359 (QA verte)

cause: le panneau Tâches planifiées n'avait aucune variante dans l'enum ViewPanel, open_view_window("scheduledTasks") rejetait INVALID et detachPanel ne touchait le placement qu'en cas de succès — même famille que #299, aucun effet visible ni message.
fix: variante ViewPanel::ScheduledTasks avec contrat stable label view-scheduledTasks / url index.html?panel=scheduledTasks / titre « Scheduled tasks », identité persistée des fenêtres view-scheduledTasks acceptée à la restauration #50; frontend ViewWindow rend le ScheduledTasksPanel du projet focalisé et ProjectsView expose le placement Fenêtre détachée via WindowGateway; retrait de la variante Projects devenue morte après #315 — le panneau Projects (coquille de la fenêtre principale) n'est plus détachable, refus INVALID gardé par tests.
QA verte: view_window_tests dont scheduled_tasks_view_window_contract_is_stable et projects_panel_is_not_detachable, persisted_identity_accepts_scheduled_tasks_view_labels, frontend ViewWindow/window gateway/ProjectsView.detach verts.

crates/app-tauri/src/commands.rs

@@ -4440,9 +4440,9 @@ pub struct FocusedProjectChangedEventDto {
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub(crate) enum ViewPanel {
-    Projects,
     Context,
     Work,
+    ScheduledTasks,
     Tickets,
     Mcp,
     Agents,
@@ -4456,9 +4456,9 @@ pub(crate) enum ViewPanel {
 impl ViewPanel {
     pub(crate) fn parse(raw: &str) -> Result<Self, ErrorDto> {
         match raw {
-            "projects" => Ok(Self::Projects),
             "context" => Ok(Self::Context),
             "work" => Ok(Self::Work),
+            "scheduledTasks" => Ok(Self::ScheduledTasks),
             "tickets" => Ok(Self::Tickets),
             "mcp" => Ok(Self::Mcp),
             "agents" => Ok(Self::Agents),
@@ -4476,9 +4476,9 @@ impl ViewPanel {
 
     pub(crate) const fn as_str(self) -> &'static str {
         match self {
-            Self::Projects => "projects",
             Self::Context => "context",
             Self::Work => "work",
+            Self::ScheduledTasks => "scheduledTasks",
             Self::Tickets => "tickets",
             Self::Mcp => "mcp",
             Self::Agents => "agents",
@@ -4492,9 +4492,9 @@ impl ViewPanel {
 
     pub(crate) const fn title(self) -> &'static str {
         match self {
-            Self::Projects => "Projects",
             Self::Context => "Project context",
             Self::Work => "Work state",
+            Self::ScheduledTasks => "Scheduled tasks",
             Self::Tickets => "Tickets",
             Self::Mcp => "MCP",
             Self::Agents => "Agents",
@@ -4814,6 +4814,25 @@ mod view_window_tests {
         assert_eq!(view_panel_from_window_label("view-mcp"), Some(panel));
     }
 
+    #[test]
+    fn scheduled_tasks_view_window_contract_is_stable() {
+        let panel = ViewPanel::parse("scheduledTasks").unwrap();
+
+        assert_eq!(panel, ViewPanel::ScheduledTasks);
+        assert_eq!(panel.as_str(), "scheduledTasks");
+        assert_eq!(panel.title(), "Scheduled tasks");
+        assert_eq!(view_window_label(panel), "view-scheduledTasks");
+        assert_eq!(view_window_url(panel), "index.html?panel=scheduledTasks");
+        assert_eq!(
+            view_panel_from_window_label("view-scheduledTasks"),
+            Some(panel)
+        );
+        assert_eq!(
+            view_panel_from_window_label("view-scheduledTasks-0000000000000000000000000000002a"),
+            Some(panel)
+        );
+    }
+
     #[test]
     fn view_window_rejects_unknown_panel() {
         let err = ViewPanel::parse("terminal").unwrap_err();
@@ -4822,6 +4841,15 @@ mod view_window_tests {
         assert!(err.message.contains("invalid view panel: terminal"));
     }
 
+    #[test]
+    fn projects_panel_is_not_detachable() {
+        let err = ViewPanel::parse("projects").unwrap_err();
+
+        assert_eq!(err.code, "INVALID");
+        assert!(err.message.contains("invalid view panel: projects"));
+        assert!(view_panel_from_window_label("view-projects").is_none());
+    }
+
     #[test]
     fn view_window_label_parser_accepts_stable_and_legacy_labels() {
         assert_eq!(

crates/app-tauri/src/lib.rs

@@ -1132,6 +1132,26 @@ mod tests {
         );
     }
 
+    #[test]
+    fn persisted_identity_accepts_scheduled_tasks_view_labels() {
+        let (kind, panel, project_id, plugin_layout, url) =
+            persisted_window_identity_from_label("view-scheduledTasks").unwrap();
+
+        assert_eq!(kind, PersistedWindowKind::View);
+        assert_eq!(panel.as_deref(), Some("scheduledTasks"));
+        assert!(project_id.is_none());
+        assert!(plugin_layout.is_none());
+        assert_eq!(url.as_deref(), Some("index.html?panel=scheduledTasks"));
+        assert_eq!(
+            persisted_view_identity_from_label(
+                "view-scheduledTasks-0000000000000000000000000000002a"
+            )
+            .unwrap()
+            .as_str(),
+            "scheduledTasks"
+        );
+    }
+
     #[test]
     fn persisted_identity_accepts_plugin_layout_view_labels() {
         let plugin_id = domain::PluginId::new("dev.idea.android-plugin").unwrap();
@@ -1157,6 +1177,7 @@ mod tests {
     fn persisted_identity_filters_unknown_or_headless_labels() {
         assert!(persisted_window_identity_from_label("mcp-server").is_none());
         assert!(persisted_window_identity_from_label("settings").is_none());
+        assert!(persisted_window_identity_from_label("view-projects").is_none());
         assert!(persisted_window_identity_from_label(
             "view-unknown-0000000000000000000000000000002a"
         )

frontend/src/adapters/window.test.ts

@@ -41,6 +41,14 @@ describe("TauriWindowGateway (#23)", () => {
     });
   });
 
+  it("passes scheduledTasks unchanged to the detached-window command", async () => {
+    await new TauriWindowGateway().openViewWindow("scheduledTasks");
+
+    expect(invoke).toHaveBeenCalledWith("open_view_window", {
+      panel: "scheduledTasks",
+    });
+  });
+
   it("opens plugin layout windows through the backend command", async () => {
     invoke.mockResolvedValueOnce({
       label: "view-plugin-layout",

frontend/src/app/ViewWindow.test.tsx

@@ -10,6 +10,7 @@ import { render, screen, waitFor, act, fireEvent } from "@testing-library/react"
 
 import { DIProvider } from "@/app/di";
 import {
+  createMockGateways,
   MockAgentGateway,
   MockFocusedProjectGateway,
   MockProjectGateway,
@@ -66,6 +67,13 @@ describe("parseViewWindowParams (#47)", () => {
     });
   });
 
+  it("accepts the detachable scheduled tasks panel", () => {
+    expect(parseViewWindowParams("?panel=scheduledTasks")).toEqual({
+      kind: "panel",
+      panel: "scheduledTasks",
+    });
+  });
+
   it("parses a plugin layout window query from the backend base64url contract", () => {
     expect(
       parseViewWindowParams(
@@ -170,6 +178,29 @@ describe("PluginLayoutWindow (#143)", () => {
 });
 
 describe("ViewWindow (#47)", () => {
+  it("renders ScheduledTasksPanel for a focused project", async () => {
+    const gateways = createMockGateways();
+    const project = await gateways.project.createProject("alpha", "/p/a");
+    const focusedProject = new MockFocusedProjectGateway();
+    gateways.focusedProject = focusedProject;
+    await focusedProject.setFocusedProject({
+      id: project.id,
+      name: project.name,
+      root: project.root,
+    });
+
+    render(
+      <DIProvider gateways={gateways}>
+        <ViewWindow panel="scheduledTasks" />
+      </DIProvider>,
+    );
+
+    await waitFor(() => expect(screen.getByText("· alpha")).toBeTruthy());
+    expect(screen.getByRole("heading", { name: "Tâches planifiées", level: 1 })).toBeTruthy();
+    expect(await screen.findByRole("button", { name: "Nouvelle tâche planifiée" })).toBeTruthy();
+    expect(await screen.findByText("Aucune tâche planifiée pour ce projet")).toBeTruthy();
+  });
+
   it("keeps the latest focused project when the initial snapshot is delayed", async () => {
     const system = new MockSystemGateway();
     const project = new MockProjectGateway();

frontend/src/features/projects/ProjectsView.detach.test.tsx

@@ -92,6 +92,17 @@ describe("ProjectsView detach to OS window (#23)", () => {
     expect(screen.queryByRole("dialog", { name: "MCP" })).toBeNull();
   });
 
+  it("detaches scheduled tasks through WindowGateway", async () => {
+    const { windowGateway } = await renderWithProject();
+    const openViewWindow = vi.spyOn(windowGateway, "openViewWindow");
+
+    pickPlacement("Tâches planifiées", "Fenêtre détachée");
+
+    await waitFor(() => expect(openViewWindow).toHaveBeenCalledWith("scheduledTasks"));
+    expect(windowGateway.open.has("scheduledTasks")).toBe(true);
+    expect(screen.queryByRole("dialog", { name: "Tâches planifiées" })).toBeNull();
+  });
+
   it("detaches project settings through the same retry-safe window path", async () => {
     const { windowGateway } = await renderWithProject();