fix: generate 15 mins intervals for demo

Author: gmlexx

web/README.md

@@ -49,7 +49,7 @@ In demo mode:
 - Realistic simulated data updates every 10 seconds
 - Solar power, battery, grid, and device data reflect realistic daily patterns
 - Electricity prices vary based on time of day
-- MPC decisions are generated for the next 24 hours
+- MPC decisions are generated for the next 24 hours in 15-minute intervals (96 decisions)
 - All UI components work exactly as they would with a real backend
 
 ## Production Build

web/src/App.css

@@ -441,7 +441,7 @@ body {
 
 .mpc-table th:not(:first-child),
 .mpc-table td:not(:first-child) {
-    width: 25px;
+    width: 30px;
     text-align: center;
 }