Add CYD photo album with jpg/png/gif viewer and sample assets.

Ship TF-card album UI, half-res decode canvas, prebuilt firmware, and documented flash/upload workflow.

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

include/ui.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "sd_info.h"
+#include <stdint.h>
+
+void ui_create();
+void ui_update(const SdCardInfo &info);
+void ui_tick();
+void ui_reload_album(); // rescan TF and show current / first photo