Preserve touch held time across gesture detection

Touch held time was being lost when gestures were detected because the gesture detection happens before the touch release event. Now remembers the held time at the moment of gesture detection and returns it within a 250ms window, allowing UI elements to properly respond to long-press gestures. Also refactors deep sleep code to use PowerManager methods.

lib/hal/HalPowerManager.cpp

@@ -1,6 +1,7 @@
 #include "HalPowerManager.h"
 
 #include <Logging.h>
+#include <PowerManager.h>
 #include <WiFi.h>
 #include <esp_sleep.h>
 
@@ -103,18 +104,9 @@ void HalPowerManager::startDeepSleep(HalGPIO& gpio) const {
   esp_sleep_config_gpio_isolate();
   gpio_deep_sleep_hold_en();
   gpio_hold_en(GPIO_SPIWP);
-  pinMode(InputManager::POWER_BUTTON_PIN, INPUT_PULLUP);
-  // Arm the wakeup trigger *after* the button is released
-  // Note: this is only useful for waking up on USB power. On battery, the MCU will be completely powered off, so the
-  // power button is hard-wired to briefly provide power to the MCU, waking it up regardless of the wakeup source
-  // configuration
-  esp_deep_sleep_enable_gpio_wakeup(1ULL << InputManager::POWER_BUTTON_PIN, ESP_GPIO_WAKEUP_GPIO_LOW);
-#else  // Xtensa (classic ESP32 / S3): RTC ext1 GPIO wake
-  pinMode(InputManager::POWER_BUTTON_PIN, INPUT_PULLUP);
-  esp_sleep_enable_ext1_wakeup(1ULL << InputManager::POWER_BUTTON_PIN, ESP_EXT1_WAKEUP_ALL_LOW);
 #endif
-  // Enter Deep Sleep
-  esp_deep_sleep_start();
+  freeink::PowerManager::armPowerButtonWakeup();
+  freeink::PowerManager::deepSleep();
 }
 
 uint16_t HalPowerManager::getBatteryPercentage() const {