Q-W2: split bank_panel.cpp (3459 LOC) into eight shell/panel TUs — reasampler::panel internals, per-seam public headers, shim retired; zero behavior change, 60/60 green

src/app/main.cpp

@@ -30,7 +30,9 @@
 #include "actions.h"
 #include "core/version/app_version.h"
 #include "core/model/bank_model.h"
-#include "bank_panel.h"
+#include "shell/panel/panel_bank_ops.h"  // selection read seam (insert action)
+#include "shell/panel/panel_input.h"     // bankPanelRefresh / project-load notify / tail seam
+#include "shell/panel/panel_window.h"    // panel lifecycle (init/toggle/shutdown)
 #include "core/capture/batch_capture.h"
 #include "shell/capture/capture.h"
 #include "ingest.h"