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/file_based_storage.c

@@ -0,0 +1,184 @@
+#include "file_based_storage.h"
+#include <libs/fatfs/ff.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct{
+	FIL active_file;
+	s32 active_file_idx;
+	char base_path[0x80];
+	u32 part_sz_sct;
+	u32 base_path_len;
+}file_based_storage_ctxt_t;
+
+static file_based_storage_ctxt_t ctx;
+
+int file_based_storage_init(const char *base_path) {
+	ctx.active_file_idx = -0xff;
+	ctx.base_path_len = strlen(base_path);
+
+	strcpy(ctx.base_path, base_path);
+	strcat(ctx.base_path, "00");
+
+	FILINFO fi;
+	if(f_stat(ctx.base_path, &fi) != FR_OK) {
+		return 0;
+	}
+
+	if(fi.fsize) {
+		ctx.part_sz_sct = fi.fsize >> 9;
+	}else{
+		return 0;
+	}
+	ctx.part_sz_sct = fi.fsize;
+	return 1;
+}
+
+void file_based_storage_end() {
+	if(ctx.active_file_idx != -0xff) {
+		f_close(&ctx.active_file);
+	}
+	ctx.active_file_idx = -0xff;
+	ctx.part_sz_sct = 0;
+}
+
+static int file_based_storage_change_file(const char *name, s32 idx) {
+	int res;
+
+	if(ctx.active_file_idx == idx){
+		return FR_OK;
+	}
+
+	if(ctx.active_file_idx != -0xff){
+		f_close(&ctx.active_file);
+		ctx.active_file_idx = -0xff;
+	}
+
+	strcpy(ctx.base_path + ctx.base_path_len, name);
+
+	#if FF_FS_READONLY == 1
+	res = f_open(&ctx.active_file, ctx.base_path, FA_READ);
+	#else
+	res = f_open(&ctx.active_file, ctx.base_path, FA_READ | FA_WRITE);
+	#endif
+
+	if(res != FR_OK){
+		return res;
+	}
+
+	ctx.active_file_idx = idx;
+
+	return FR_OK;
+}
+
+static int file_based_storage_readwrite_single(u32 sector, u32 num_sectors, void *buf, bool is_write){
+	#if FF_FS_READONLY == 1
+	if(is_write){
+		return FR_WRITE_PROTECTED;
+	}
+	#endif
+
+	int res = f_lseek(&ctx.active_file, (u64)sector << 9);
+	if(res != FR_OK){
+		return res;
+	}
+
+	if(is_write){
+		res = f_write(&ctx.active_file, buf, (u64)num_sectors << 9, NULL);
+	}else{
+		res = f_read(&ctx.active_file, buf, (u64)num_sectors << 9, NULL);
+	}
+
+	if(res != FR_OK){
+		return res;
+	}
+
+	return FR_OK;
+}
+
+int file_based_storage_readwrite(u32 sector, u32 num_sectors, void *buf, bool is_write) {
+	#if FF_FS_READONLY == 1
+	if(is_write){
+		return 0;
+	}
+	#endif
+
+	if(ctx.part_sz_sct == 0){
+		return 0;
+	}
+
+	int res;
+
+	u32 scts_left = num_sectors;
+	u32 cur_sct = sector;
+
+	while(scts_left){
+		u32 offset = cur_sct % ctx.part_sz_sct;
+		u32 sct_cnt = ctx.part_sz_sct - offset;
+		sct_cnt = MIN(scts_left, sct_cnt);
+
+		u32 file_idx = cur_sct / ctx.part_sz_sct;
+
+		if((s32) file_idx != ctx.active_file_idx) {
+			char name[3];
+			if(file_idx < 10){
+				strcpy(name, "0");
+			}
+			itoa(file_idx, name + strlen(name), 10);
+
+			res = file_based_storage_change_file(name, file_idx);
+			if(res != FR_OK){
+				return 0;
+			}
+		}
+
+		res = file_based_storage_readwrite_single(offset, sct_cnt, buf + ((u64)(num_sectors - scts_left) << 9), is_write);
+		if(res != FR_OK){
+			return 0;
+		}
+
+		cur_sct += sct_cnt;
+		scts_left -= sct_cnt;
+	}
+
+	f_sync(&ctx.active_file);
+	return 1;
+}
+
+int file_based_storage_read(u32 sector, u32 num_sectors, void *buf) {
+	return file_based_storage_readwrite(sector, num_sectors, buf, false);
+}
+
+int file_based_storage_write(u32 sector, u32 num_sectors, void *buf) {
+	return file_based_storage_readwrite(sector, num_sectors, buf, true);
+}
+
+u32 file_based_storage_get_total_size() {
+	u32 total_size_sct = 0;
+	char file_path[0x80];
+	u32 cur_idx = 0;
+	int res;
+
+	strcpy(file_path, ctx.base_path);
+	strcpy(file_path + ctx.base_path_len, "00");
+
+	FILINFO fi;
+	res = f_stat(file_path, &fi);
+
+	while(res == FR_OK){
+		cur_idx++;
+		total_size_sct += fi.fsize >> 9;
+
+		char name[3] = "0";
+		if(cur_idx >= 10){
+			name[0] = '\0';
+		}
+		itoa(cur_idx, name + strlen(name), 10);
+
+		strcpy(file_path + ctx.base_path_len, name);
+
+		res = f_stat(file_path, &fi);
+	}
+
+	return total_size_sct;
+}