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esp_sleep_enable_gpio_wakeup_on_hp_periph_powerdown() only exists on
ESP32-C6 (SOC_GPIO_SUPPORT_HP_PERIPH_PD_SLEEP_WAKEUP), so the ee02
(ESP32-S3) build failed with implicit-declaration errors in
{back,next,combo}_button.c once the epd13in3e driver's #error stopped
masking it.
Each button file now branches on that capability macro: the C6 path
(devkit/xiao) is untouched, and ESP32-S3 uses
esp_sleep_enable_ext1_wakeup_io() instead. The earlier ext1 attempt was
rejected on C6 hardware because its pull resistor didn't hold across
RTC_PERIPH power-down -- tracing the same path in ESP-IDF source shows
gpio_config()'s pull_up_en already delegates to rtc_gpio_pullup_en()
for RTC-capable pins on every non-original-ESP32 target, so the pull-up
should already survive the same power-down on S3. The _io() variant is
additive, so the three button files don't need cross-file mask
coordination. Also widens the button GPIO Kconfig range for
IDF_TARGET_ESP32S3 (0-21, matching its RTC-IO set) instead of the
C6-shaped 0-7.
Verified: ee02, devkit, and xiao all build clean end-to-end locally
(native ESP-IDF v6.0, no Docker in this sandbox). NOT verified: whether
this actually avoids the spurious-instant-wakeup bug on real EE02
hardware -- that failure mode was only ever confirmed empirically, not
root-caused in a way a compile can check. continue-on-error stays on
in CI's ee02 build step until that's confirmed.