Bump version to 6.2.4 and add release notes

Updated version from 6.2.3 to 6.2.4 and added highlights.
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2026-04-01 21:44:28 +02:00
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## Current firmware
- **Version:** 6.2.3
- **Version:** 6.2.4
- **Release date:** 2026-04-01
- **Target MCU:** Seeed XIAO ESP32C3
- **Display:** 20x4 I²C LCD (PCF8574, default address `0x27`)
- **API endpoint:** `https://api.energy-charts.info/price?bzn=SI`
- **Resolution:** 15minute intervals, hourly averages for overview
## Highlights of v6.2.4
- **BUG FIX:** Exact-boundary display refresh bug
- Problem: At the exact top of the hour (e.g., 20:00:00), the display automatically refreshed but showed the PREVIOUS hour's data (19:00). This happened because the "next-boundary" rounding logic in findCurrentPriceIndex() incorrectly excluded the current interval if the time was exactly on the boundary.
- Fix: Simplified findCurrentPriceIndex() to use a robust "last entry <= now" comparison. This ensures the display transitions to the new hour instantaneously at XX:00:00.
## Highlights of v6.2.3
- **BUG FIX**: State-based display refresh logic