Fix XIAO nRF52 BME280 I2C pins #1484
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Summary\n- Align XIAO nRF52840 I2C wiring to D6 (SDA) / D7 (SCL) to avoid LoRa pin conflicts.\n- Add BME280 address auto-detect (0x76/0x77) on the environment sensor bus.\n\n## Testing\n- pio run -e Xiao_nrf52_repeater\n\nFixes #1448