feat(tickets): filtres multi-critères par cases à cocher (backend + frontend)

Passe les filtres de la liste des tickets en sélection multiple (#12).

Backend Rust :
- IssueListFilter : statuses/priorities en Vec, filter_matches en OR intra-champ
  et AND inter-champs
- TicketListRequestDto en tableaux + from_request (parse/déduplication)
- MCP idea_ticket_list aligné sur le nouveau contrat

Frontend :
- TicketListQuery.statuses/priorities
- UI de cases à cocher, toggle/clear des filtres

Tests verts : issue_store (7), app-tauri --lib (59), mcp_server (24),
issue_usecases (6), sprint_usecases (6), frontend vitest (505), npm run build (exit 0).

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

frontend/src/adapters/ticket.ts

@@ -58,8 +58,16 @@ export class TauriTicketGateway implements TicketGateway {
   }
 
   async list(projectId: string, query?: TicketListQuery): Promise<TicketList> {
+    const { statuses, priorities, ...rest } = query ?? {};
+    // Multi-select facets (ticket #12): the backend expects `statuses`/
+    // `priorities` arrays (empty ⇒ no constraint on that facet).
     return invoke<TicketList>("ticket_list", {
-      request: { projectId, ...(query ?? {}) },
+      request: {
+        projectId,
+        statuses: statuses ?? [],
+        priorities: priorities ?? [],
+        ...rest,
+      },
     });
   }