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"
         )