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_bank_grid.cpp

@@ -13,7 +13,7 @@
 // keyboard nav (arrow clamp, row moves, shift-extend, partial-last-row clamp,
 // fresh-panel focus).
 
-#include "../src/bank_grid.h"
+#include "../src/core/ui/bank_grid.h"
 
 #include <cmath>
 #include <cstdio>
@@ -21,6 +21,7 @@
 #include <vector>
 
 using namespace reasampler;
+using namespace reasampler::ui;
 
 static int g_fail = 0;
 #define CHECK(cond) do { if(!(cond)) { \