feat(tickets): persistance des filtres tickets entre redémarrages (#29)

Introduit le port UiPreferencesGateway et son adapter uiPreferences,
avec le module ticketFilterPersistence qui sauvegarde/restaure les
filtres (recherche, statut, sprint, agents) via useTickets,
useTicketSearch et useProjectAgents. Couvert par tests unitaires et
un test d'intégration.

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

frontend/src/features/tickets/useTickets.ts

@@ -11,7 +11,7 @@
  * or out of a sprint. Sprint lifecycle events refresh the sprint list.
  */
 
-import { useCallback, useEffect, useMemo, useState } from "react";
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 
 import {
   isSprintEvent,
@@ -25,6 +25,10 @@ import {
 } from "@/domain";
 import type { CreateTicketInput, TicketListQuery } from "@/ports";
 import { useGateways } from "@/app/di";
+import {
+  hydrateListFilters,
+  persistListFilters,
+} from "./ticketFilterPersistence";
 
 export interface TicketsViewModel {
   list: TicketList | null;
@@ -76,12 +80,33 @@ function describe(e: unknown): string {
 }
 
 export function useTickets(projectId: string): TicketsViewModel {
-  const { ticket, system } = useGateways();
+  const { ticket, system, uiPreferences } = useGateways();
   const [list, setList] = useState<TicketList | null>(null);
   const [sprints, setSprints] = useState<Sprint[]>([]);
   const [error, setError] = useState<string | null>(null);
   const [busy, setBusy] = useState(false);
-  const [query, setQuery] = useState<TicketListQuery>({});
+  // Hydrate the filters persisted for this project (ticket #29) on first render
+  // so reopening the window restores them without a flash of defaults. The
+  // assignee, if any, is validated for shape here and reconciled against the
+  // live agent roster by the panel (an obsolete assignee is then cleared).
+  const [query, setQuery] = useState<TicketListQuery>(() =>
+    hydrateListFilters(uiPreferences, projectId),
+  );
+
+  // Re-hydrate when the hosting project changes (the mounted hook is normally
+  // pinned to one project, but stay correct if `projectId` is swapped in place).
+  const hydratedProject = useRef(projectId);
+  useEffect(() => {
+    if (hydratedProject.current === projectId) return;
+    hydratedProject.current = projectId;
+    setQuery(hydrateListFilters(uiPreferences, projectId));
+  }, [projectId, uiPreferences]);
+
+  // Persist the filters (minus the opaque cursor) whenever they change, scoped
+  // to this project's list key.
+  useEffect(() => {
+    persistListFilters(uiPreferences, projectId, query);
+  }, [uiPreferences, projectId, query]);
 
   // Stable dependency key so `refresh` only changes when a filter actually does.
   const queryKey = useMemo(() => JSON.stringify(query), [query]);