feat(workstate): UI des délégations en file par agent (Lot B frontend)

Affiche les tickets en attente dans `ProjectWorkStatePanel` à partir du
snapshot de file exposé par le read-model : type de domaine et adaptateur
mock alignés sur le DTO `camelCase`, panneau enrichi (requester, aperçu de
tâche, position FIFO), hook de lecture mis à jour.

Tests verts : workstate.test.tsx + projects.test.tsx (2 fichiers / 17),
`tsc --noEmit` OK.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/domain/index.ts

@@ -149,6 +149,26 @@ export type WorkBusyState =
   | { state: "idle" }
   | { state: "busy"; ticket: string; sinceMs: number };
 
+/** FIFO status for an input/ticket currently tracked by the backend queue. */
+export type TicketWorkStatus = "inProgress" | "queued";
+
+/** Who produced an input/ticket in the work-state read-model. */
+export type TicketWorkSource =
+  | { kind: "human" }
+  | { kind: "agent"; agentId: string };
+
+/** One queued or in-progress input/ticket for an agent. */
+export interface AgentTicketState {
+  ticketId: string;
+  conversationId: string;
+  position: number;
+  status: TicketWorkStatus;
+  source: TicketWorkSource;
+  requesterLabel: string;
+  taskPreview: string;
+  taskLen: number;
+}
+
 /** One agent row in the project work-state read-model. */
 export interface AgentWorkState {
   agentId: string;
@@ -156,6 +176,7 @@ export interface AgentWorkState {
   profileId: string;
   live?: LiveWorkSession;
   busy: WorkBusyState;
+  tickets: AgentTicketState[];
 }
 
 /** Minimal read-only live-state surface for a project. */