Q-W1 pt2: core/shell/app relocation + sub-namespaces; one concrete ui::Rect (LTRB fork retired); slot_map split from bank_book; BankIndex→BankModel; 59/59 green

tests/test_card_drag.cpp

@@ -7,11 +7,12 @@
 // -> None); cursor-cue mapping (incl. Replace only for Replace); slot rects include empties
 // (gap layout), dense layout matches a plain grid, slot hit-test returns slot index + miss.
 
-#include "../src/card_drag.h"
+#include "../src/core/ui/card_drag.h"
 
 #include <cstdio>
 
 using namespace reasampler;
+using namespace reasampler::ui;
 
 static int g_fail = 0;
 #define CHECK(cond) do { if(!(cond)) { \