feat: add Socket.IO WebSocket gateway for real-time sync notifications

fix: safe break sync cascade deletes + better error logging

fix: total force redeploy v6

fix: absolute definitive dark mode force v5

fix: total dark mode immersion and 2x2 grid stabilization v4

fix: total clean production build sync

fix: total inline style force for luxury dark theme v3

chore: absolute clean sync for Vercel dark mode

fix: index.css import order and final dark mode polish

fix: clean Dashboard.tsx and repair build failure

chore: force redeploy trigger 08:43

fix: aggressive dark mode force and 2x2 grid stabilization

fix: total dark mode immersion and layout stabilization

fix: explicit dark theme and 2x2 grid layout force

feat: pro-level luxury dark theme and 2x2 dashboard grid deployment