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/frontend/gui_emu_tools.h

@@ -0,0 +1,8 @@
+#ifndef _GUI_EMU_TOOLS_H_
+#define _GUI_EMU_TOOLS_H_
+
+#include <libs/lvgl/lvgl.h>
+
+lv_res_t create_win_emu_tools(lv_obj_t *btn);
+
+#endif