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.

frontend/src/adapters/mock/index.ts

@@ -83,6 +83,7 @@ import type {
   ResumableAgent,
   ResolvedAgentPermissions,
   ResolvedAgentSystemPermissions,
+  ScheduledProjectTask,
   ServerExposurePreview,
   ServerExposureSettings,
   Skill,
@@ -168,6 +169,8 @@ import type {
   SetProjectPluginEnabledInput,
   SaveOpenCodeProviderProfileInput,
   SendAgentChatOptions,
+  ScheduledTaskDefinitionInput,
+  ScheduledTaskGateway,
   SkillGateway,
   StoppedLiveAgent,
   SystemGateway,
@@ -3247,6 +3250,112 @@ export class MockPermissionGateway implements PermissionGateway {
   }
 }
 
+export class MockScheduledTaskGateway implements ScheduledTaskGateway {
+  private readonly tasks = new Map<string, ScheduledProjectTask[]>();
+  private nextId = 1;
+
+  /** Test/dev helper for agent-originated pending proposals. */
+  _seed(task: ScheduledProjectTask): void {
+    this.tasks.set(task.projectId, [
+      ...(this.tasks.get(task.projectId) ?? []).filter((item) => item.id !== task.id),
+      structuredClone(task),
+    ]);
+  }
+
+  async list(projectId: string): Promise<ScheduledProjectTask[]> {
+    return structuredClone(this.tasks.get(projectId) ?? []);
+  }
+
+  async create(
+    projectId: string,
+    input: ScheduledTaskDefinitionInput,
+  ): Promise<ScheduledProjectTask> {
+    const now = Date.now();
+    const task: ScheduledProjectTask = {
+      id: `mock-scheduled-${this.nextId++}`,
+      projectId,
+      ...structuredClone(input),
+      approval: "approved",
+      sandbox: "projectReadWrite",
+      nextRunAtMs: input.enabled ? now + 3_600_000 : null,
+      createdBy: { kind: "human" },
+      updatedBy: { kind: "human" },
+      createdAtMs: now,
+      updatedAtMs: now,
+      auditRevision: 1,
+    };
+    this.tasks.set(projectId, [...(this.tasks.get(projectId) ?? []), task]);
+    return structuredClone(task);
+  }
+
+  async update(
+    projectId: string,
+    scheduledTaskId: string,
+    auditRevision: number,
+    input: ScheduledTaskDefinitionInput,
+  ): Promise<ScheduledProjectTask> {
+    const rows = this.tasks.get(projectId) ?? [];
+    const index = rows.findIndex((task) => task.id === scheduledTaskId);
+    if (index < 0) throw { code: "NOT_FOUND", message: "scheduled task not found" };
+    if (rows[index].auditRevision !== auditRevision) {
+      throw { code: "INVALID", message: "scheduled task revision conflict" };
+    }
+    const updated: ScheduledProjectTask = {
+      ...rows[index],
+      ...structuredClone(input),
+      approval: "approved",
+      nextRunAtMs: input.enabled ? Date.now() + 3_600_000 : null,
+      updatedBy: { kind: "human" },
+      updatedAtMs: Date.now(),
+      auditRevision: auditRevision + 1,
+    };
+    rows[index] = updated;
+    return structuredClone(updated);
+  }
+
+  async delete(projectId: string, scheduledTaskId: string): Promise<void> {
+    this.tasks.set(
+      projectId,
+      (this.tasks.get(projectId) ?? []).filter((task) => task.id !== scheduledTaskId),
+    );
+  }
+
+  async runNow(projectId: string, scheduledTaskId: string): Promise<ScheduledProjectTask> {
+    const rows = this.tasks.get(projectId) ?? [];
+    const task = rows.find((row) => row.id === scheduledTaskId);
+    if (!task) throw { code: "NOT_FOUND", message: "scheduled task not found" };
+    const updated = {
+      ...task,
+      lastRunAtMs: Date.now(),
+      lastTaskId: `mock-background-${scheduledTaskId}`,
+      auditRevision: task.auditRevision + 1,
+    };
+    rows[rows.indexOf(task)] = updated;
+    return structuredClone(updated);
+  }
+
+  async setEnabled(
+    projectId: string,
+    scheduledTaskId: string,
+    enabled: boolean,
+  ): Promise<ScheduledProjectTask> {
+    const rows = this.tasks.get(projectId) ?? [];
+    const task = rows.find((row) => row.id === scheduledTaskId);
+    if (!task) throw { code: "NOT_FOUND", message: "scheduled task not found" };
+    const updated: ScheduledProjectTask = {
+      ...task,
+      enabled,
+      approval: enabled ? "approved" : task.approval === "pending" ? "rejected" : task.approval,
+      nextRunAtMs: enabled ? Date.now() + 3_600_000 : null,
+      updatedBy: { kind: "human" },
+      updatedAtMs: Date.now(),
+      auditRevision: task.auditRevision + 1,
+    };
+    rows[rows.indexOf(task)] = updated;
+    return structuredClone(updated);
+  }
+}
+
 export class MockWorkStateGateway implements WorkStateGateway {
   private states = new Map<string, ProjectWorkState>();
   private backgroundTaskStreams = new Map<
@@ -4854,6 +4963,7 @@ export function createMockGateways(): Gateways {
     device: new MockDeviceGateway(),
     permission: new MockPermissionGateway(),
     workState: new MockWorkStateGateway(),
+    scheduledTask: new MockScheduledTaskGateway(),
     conversation: new MockConversationGateway(),
     ticket: new MockTicketGateway(systemGateway),
     window: new MockWindowGateway(),