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/utils/util.c

@@ -15,6 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <storage/boot_storage.h>
 #include <string.h>
 
 #include <mem/heap.h>
@@ -273,6 +274,7 @@ void power_set_state(power_state_t state)
 	u8 reg;
 
 	// Unmount and power down sd card.
+	boot_storage_end();
 	sd_end();
 
 	// De-initialize and power down various hardware.