Various improvements (#547)

- Fixed crash when returning to Setup app (from any of the steps)
- Fixed crash when returning to TimeDateSettings app (after locale selection)
- Fixed GuiService inconsistent behaviour: now always perform operations async (e.g. to show/hide apps). This fixes crashes in some onHide() calls where onHide() might be called before onShow() was called.
- Fix for incorrect WebServService path
- Remove CYD-4848S040C SD card functionality, but added a GPIO fix for releasing 3-wire SPI pin sharing.
- Fix for saving/loading settings for various apps

Devices/cyd-4848s040c/Source/devices/St7701Display.cpp

@@ -12,9 +12,25 @@
 #include <esp_lcd_panel_ops.h>
 #include <esp_lcd_panel_io_additions.h>
 #include <esp_lcd_st7701.h>
+#include <esp_rom_gpio.h>
+#include <soc/spi_periph.h>
+#include <driver/spi_master.h>
 
 static const auto LOGGER = tt::Logger("St7701Display");
 
+// GPIO47/48 are physically shared between this bit-banged 3-wire command bus
+// and the SD card's real SPI2 bus (no alternate pins exist on this PCB).
+// esp_lcd_new_panel_io_3wire_spi() reconfigures them as plain GPIO via
+// gpio_config(), severing their SPI2 matrix routing. Reconnect them here once
+// the vendor init sequence is done, so SD card reads/writes keep working.
+// Safe only because nothing else calls into the ST7701 IO handle after boot.
+static void reclaimSpiPinsForSdCard() {
+    esp_rom_gpio_connect_out_signal(GPIO_NUM_47, spi_periph_signal[SPI2_HOST].spid_out, false, false);
+    esp_rom_gpio_connect_out_signal(GPIO_NUM_48, spi_periph_signal[SPI2_HOST].spiclk_out, false, false);
+    gpio_set_direction(GPIO_NUM_47, GPIO_MODE_OUTPUT);
+    gpio_set_direction(GPIO_NUM_48, GPIO_MODE_OUTPUT);
+}
+
 static const st7701_lcd_init_cmd_t st7701_lcd_init_cmds[] = {
     //  {cmd, { data }, data_size, delay_ms}
     {0xFF, (uint8_t[]) {0x77, 0x01, 0x00, 0x00, 0x10}, 5, 0},
@@ -181,6 +197,8 @@ bool St7701Display::createPanelHandle(esp_lcd_panel_io_handle_t ioHandle, esp_lc
         return false;
     }
 
+    reclaimSpiPinsForSdCard();
+
     return true;
 }