Cheapest Power Hours

Build me a wide Grok Bot Page called "Cheapest Power Hours" from a year of half-hourly electricity prices for [your region and tariff, for example London on Octopus Agile], from [start date] to [end date]. For each day, find the cheapest unbroken four-hour run and note when it started. At the top, four numbers with the exact counts: winter days (November to February) whose cheapest 4 hours started overnight, spring and summer days (April to August) whose cheapest 4 hours started late morning to midday, days whose cheapest 4 hours touched 16:00 to 19:00, and negative-price half-hours. Then an hourly bar chart of the average price per clock hour with a month picker, so I can flip between winter and summer. Then a stacked chart of overnight, midday and other start times per month. Then a cost calculator: one 30 kWh load in the cheapest 4 hours against 17:00 to 21:00, per month. Then a short "What to do" list by season with a Copy button on each tip. Use pence per kWh including VAT, label every chart, and say which numbers are measured and which are explanation. Every control must really work on the Page.