feat(library): add ordered backlog page and up-next dashboard tile

src/pages/Dashboard.visitSync.test.jsx

@@ -36,6 +36,7 @@ describe('Dashboard sync on a visit', () => {
             'GET /api/library/stats': json(200, {trend: null}),
             'GET /api/library/steam-profile': json(200, {personaName: 'Lobo', avatarUrl: null}),
             'GET /api/library/activity': json(200, {totalMinutes: 0, days: [], recentGames: []}),
+            'GET /api/library/backlog': json(200, {games: []}),
             'GET /api/library/games-count': json(200, {count: 1, hasSteamId: true, syncStarted: true}),
             'GET /api/library/sync-status': () => json(200, syncStatus),
             'GET /api/library/achievements/summary': json(200, {unlocked: 0, startedGames: 0, perfectGames: 0,