feat(backend,frontend): tâches planifiées projet — tool MCP idea_scheduled_task_* et menu utilisateur #305, fix transcript lié indisponible après reboot #314 (QA verte)

#305: nouvel agrégat durable ScheduledProjectTask dans domain (scheduled_task.rs, ids, ports ScheduledProjectTaskStore), source de vérité <app_data_dir>/scheduled-project-tasks/<projectId>.json, schedules bornés V1 interval/daily/weekly avec fuseau, cycle À approuver/Active/Suspendue avec approbation obligatoire des tâches demandées par agent; use cases application/scheduled_task (list/create/update/delete/run_now/reconcile/fire) réutilisant BackgroundTask pour les runs avec distinction planifié/manuel; store infrastructure dédié + scheduler reconcile au boot sans rattrapage en rafale, cwd confiné au projet; 7 tools MCP idea_scheduled_task_* (list/read lecture seule, create/update/delete/run_now/set_enabled write-actions soumises aux permissions natives); commandes Tauri + routes HTTP aux contrats DTO identiques (camelCase nextRunAtMs/lastRunAtMs/lastTaskId/createdBy/updatedBy); frontend: gateways Tauri/HTTP/mock + types ports/domain, surface projet 'Tâches planifiées' (liste utilisateur+agent unifiée, création/édition avec récapitulatif avant activation, approbation/refus, exécuter maintenant, suspendre/reprendre, suppression), catalogage surface web (webSurfaceCatalog/viewPlacement/ViewPanelBody/WebWorkspace); docs/scheduled-project-tasks.md et sdk docs/services.md (047c38b: pas un service plugin V1, pas d'émulation via cron système).

#314: correction de 'Conversation liée — transcript indisponible' après reboot: restauration du transcript lié côté application (orchestrator service, lifecycle, session_limit, background sink, terminal registry) et côté frontend (adapters agent/http frames/stream/requestResponse, workStateNormalization, CustomAgentChatView avec état et action utile), tests dto_chat/agent_lifecycle/structured_registry_d1/background_completion_sink étendus.

QA verte rapportée par QA sur feature/305-scheduled-project-tasks-mcp, sans bloquant, pour #305 et #314.

Hors périmètre worktree: tickets non liés, attachments/, scripts/; aucun push.

crates/domain/src/ports.rs

@@ -1037,6 +1037,16 @@ pub enum ScheduledTask {
         /// id, comme le reste du chemin de reprise §15).
         conversation_id: Option<String>,
     },
+    /// Fire a durable project task. The application re-reads the definition
+    /// before execution so stale one-shot payloads cannot bypass updates.
+    FireProjectTask {
+        /// Owning project.
+        project_id: ProjectId,
+        /// Durable definition id.
+        scheduled_task_id: crate::ScheduledTaskId,
+        /// Occurrence this wake-up represents.
+        planned_at_ms: u64,
+    },
 }
 
 // ---------------------------------------------------------------------------
@@ -1272,6 +1282,20 @@ pub enum BackgroundTaskPortError {
     Store(String),
 }
 
+/// Errors from the machine-local scheduled task store.
+#[derive(Debug, Clone, PartialEq, Eq, Error)]
+pub enum ScheduledTaskStoreError {
+    /// Requested definition is absent.
+    #[error("scheduled project task not found")]
+    NotFound,
+    /// Persisted or supplied data is invalid.
+    #[error("scheduled project task invalid: {0}")]
+    Invalid(String),
+    /// Persistence failed.
+    #[error("scheduled project task store failed: {0}")]
+    Store(String),
+}
+
 /// Errors from the owner wake port.
 #[derive(Debug, Clone, PartialEq, Eq, Error)]
 pub enum WakeError {
@@ -2790,6 +2814,40 @@ pub trait BackgroundTaskStore: Send + Sync {
     ) -> Result<(), BackgroundTaskPortError>;
 }
 
+/// Persistence port for durable project-scoped schedule definitions and audit.
+#[async_trait]
+pub trait ScheduledProjectTaskStore: Send + Sync {
+    /// Lists one project's definitions.
+    async fn list(
+        &self,
+        project_id: ProjectId,
+    ) -> Result<Vec<crate::ScheduledProjectTask>, ScheduledTaskStoreError>;
+    /// Reads one definition.
+    async fn get(
+        &self,
+        project_id: ProjectId,
+        scheduled_task_id: crate::ScheduledTaskId,
+    ) -> Result<Option<crate::ScheduledProjectTask>, ScheduledTaskStoreError>;
+    /// Upserts a definition and appends its audit entry atomically.
+    async fn save(
+        &self,
+        task: &crate::ScheduledProjectTask,
+        audit: crate::ScheduledTaskAuditEntry,
+    ) -> Result<(), ScheduledTaskStoreError>;
+    /// Deletes a definition and appends its audit entry atomically.
+    async fn delete(
+        &self,
+        project_id: ProjectId,
+        scheduled_task_id: crate::ScheduledTaskId,
+        audit: crate::ScheduledTaskAuditEntry,
+    ) -> Result<(), ScheduledTaskStoreError>;
+    /// Lists enabled, approved definitions whose persisted deadline is due.
+    async fn list_due(
+        &self,
+        now_ms: u64,
+    ) -> Result<Vec<crate::ScheduledProjectTask>, ScheduledTaskStoreError>;
+}
+
 /// Execution port for first-class background tasks.
 #[async_trait]
 pub trait BackgroundTaskRunner: Send + Sync {