Angular State Management in 2026 — NgRx, Signals, NGXS, Akita Compared (with Real Numbers)

TL;DR — We rebuilt Mattrx's Angular state layer over 8 months (Angular 16 → 19, ~22k LOC TS). State LOC 8,400 → 3,100 (-63%), state-related bundle 38 KB → 18 KB, /campaigns re-renders per filter keyst