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Fix UART0 communication failure on ESP-IDF 5.4.2+ that affected LD2410 and other UART sensors on default UART0 pins across all ESP32 variants. The gpio_reset_pin() workaround from PR #12519 sets GPIO_MODE_DISABLE which disables the input buffer. Without a subsequent pin->setup() call, uart_set_pin() on IOMUX-connected UART0 default pins does not re-enable the input buffer, so the RX pin cannot receive data. PR #11914 made pin->setup() conditional on pull/open-drain flags, which meant most users' UART0 RX pins never got their input buffer re-enabled. The fix: always call pin->setup() for pins matching U0TXD_GPIO_NUM or U0RXD_GPIO_NUM to restore proper GPIO direction after gpio_reset_pin(). For non-UART0 pins, the conditional behavior is preserved to avoid breaking external components (issue #11823). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
