not support board bpi_leaf_s3

**Describe the problem you have/What new integration you would like**

the platformio/espressif32 is support bpi_leaf_s3, https://registry.platformio.org/platforms/platformio/espressif32/boards?p=1
but esphome is not support it ,it is say "This board is unknown, please set the variant manually."
**Please describe your use case for this integration and alternatives you've tried:**

**Additional context**

The issue names no repository files or tests. Start by reviewing how ESPHome handles board and variant selection, then compare that with the PlatformIO espressif32 definition for bpi_leaf_s3. Done means the board is recognized without manually setting the variant and a matching configuration builds successfully.

Written by the indexing model from the issue text.