feat(power): add battery monitoring and status overlays

components/platform/internal/lcd_direct.h

@@ -12,6 +12,7 @@ extern "C" {
 esp_err_t lcd_direct_init_device(void);
 void lcd_direct_start_render_loop(void);
 esp_err_t lcd_direct_stop_render_loop(int timeout_ms);
+esp_err_t lcd_direct_set_status_overlay(const platform_lcd_status_overlay_t *overlay);
 esp_err_t lcd_direct_request_presentation(const platform_lcd_presentation_request_t *request);
 esp_err_t lcd_direct_preheat_presentation(const platform_lcd_presentation_request_t *request);
 uint32_t lcd_direct_presentation_completion_count(void);

components/platform/internal/lcd_direct_assets.h

@@ -23,6 +23,8 @@ typedef struct {
 
 #define LCD_DIRECT_NO_ICON 0xFFFFU
 #define LCD_DIRECT_DEFAULT_ICON_COUNT 5U
+#define LCD_DIRECT_ICON_CHARGING 5U
+#define LCD_DIRECT_ICON_LOW_BATTERY 6U
 
 const lcd_direct_image_t *lcd_direct_default_image(void);
 const lcd_direct_image_t *lcd_direct_asset_frame(const char *asset_dir, uint8_t frame_index);

components/platform/internal/platform_battery_internal.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef enum {
+    PLATFORM_BATTERY_LOAD_AUDIO = 0,
+    PLATFORM_BATTERY_LOAD_STEPPER,
+    PLATFORM_BATTERY_LOAD_COUNT,
+} platform_battery_load_source_t;
+
+void platform_battery_load_begin(platform_battery_load_source_t source);
+void platform_battery_load_end(platform_battery_load_source_t source);