Nyx: emuMMC Manage window, Tools UI, and misc updates

- Add gui_emu_tools: emuMMC Manage window with correct positioning (LV_PROTECT_PARENT + re-parent to win)
- Tools: single SD button (tap = SD partition manager, 3s hold = eMMC)
- Remove emuSD from Nyx UI (tabs, UMS, partition manager); keep bootloader emusd
- Shorten Create emuMMC description text by one character
- Storage/build/config and dependency updates

Co-authored-by: Cursor <cursoragent@cursor.com>

nyx/nyx_gui/storage/sfd.c

@@ -0,0 +1,86 @@
+#include "sfd.h"
+#include <storage/emmc.h>
+#include <storage/sdmmc.h>
+#include <storage/file_based_storage.h>
+#include <libs/fatfs/diskio.h>
+#include <string.h>
+
+
+static bool file_based;
+static sdmmc_storage_t *_storage;
+static u32 _offset;
+static u32 _size;
+
+static void ensure_partition(){
+	if(_storage == &emmc_storage){
+		emmc_set_partition(EMMC_GPP);
+	}
+}
+
+sdmmc_storage_t *sfd_get_storage(){
+	if(file_based){
+		return NULL;
+	}else{
+		return _storage;
+	}
+}
+
+int sfd_read(u32 sector, u32 count, void *buff){
+	int res;
+	if(sector + count > _size){
+		return 0;
+	}
+
+	if(file_based){
+		res = file_based_storage_read(sector, count, buff);
+	}else{
+		ensure_partition();
+		res = sdmmc_storage_read(_storage, sector + _offset, count, buff);
+	}
+	return res;
+}
+
+int sfd_write(u32 sector, u32 count, void *buff){
+	int res;
+	if(sector + count > _size){
+		return 0;
+	}
+
+	if(file_based){
+		res = file_based_storage_write(sector, count, buff);
+	}else{
+		ensure_partition();
+		res = sdmmc_storage_write(_storage, sector + _offset, count, buff);
+	}
+
+	return res;
+}
+
+bool sfd_init(sdmmc_storage_t *storage, u32 offset, u32 size){
+	_storage = storage;
+	_offset = offset;
+	_size = size;
+	disk_set_info(DRIVE_SFD, SET_SECTOR_COUNT, &size);
+	return true;
+}
+
+bool sfd_file_based_init(const char *base_path) {
+	file_based = true;
+	if(!file_based_storage_init(base_path)){
+		gfx_printf("file based init fail\n");
+		return 0;
+	}
+	_size = file_based_storage_get_total_size();
+	disk_set_info(DRIVE_SFD, SET_SECTOR_COUNT, &_size);
+
+	return 1;
+}
+
+void sfd_end(){
+	_storage = NULL;
+	_offset = 0;
+	_size = 0;
+	u32 size = 0;
+	file_based = false;
+	disk_set_info(DRIVE_SFD, SET_SECTOR_COUNT, &size);
+}