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>

bdk/storage/mbr_gpt.c

@@ -0,0 +1,39 @@
+#include "mbr_gpt.h"
+#include <utils/types.h>
+#include <string.h>
+
+bool mbr_has_gpt(const mbr_t *mbr){
+	for(u32 i = 0; i < 4; i++){
+		if(mbr->partitions[i].type == 0xee){
+			return true;
+		}
+	}
+	return false;
+}
+
+void wctombs(const u16 *src, char *dest, u32 len_max){
+	const u16 *cur = src;
+	do{
+		*dest++ = *cur & 0xff;
+		len_max--;
+	}while(*cur++ && len_max);
+}
+
+void ctowcs(const char *src, u16 *dest, u32 len_max){
+	const char *cur = src;
+	do{
+		*dest++ = *cur;
+		len_max--; 
+	}while(*cur++ && len_max);
+}
+
+s32 gpt_get_part_by_name(gpt_t *gpt, const char* name, s32 prev){
+	u16 wc_name[36];
+	ctowcs(name, wc_name, 36);
+	for(s32 i = prev + 1; i < (s32)gpt->header.num_part_ents && i < 128; i++){
+		if(!memcmp(wc_name, gpt->entries[i].name, strlen(name) * 2)){
+			return i;
+		}
+	}
+	return -1;
+}