feat(bank_panel): docked bank grid with LICE waveform thumbnails (M5 Wave A)

Docked SWELL window toggled by a new action, drawing the current bank as
per-sample min/max thumbnails (PCM_source + peaks) with an in-memory cache.
Pure grid-layout/cache-key math in bank_grid (tested). Renames peaks::Sample
-> AudioSample to avoid colliding with bank_model::Sample.

src/resource.rc

@@ -0,0 +1,22 @@
+// resource.rc — SWELL/Win32 dialog templates for ReaSampler.
+//
+// Windows: compiled by the platform resource compiler (MSVC rc / windres) and
+// linked into reaper_reasampler.
+// macOS/Linux: pre-processed once by SWELL's resgen into a C++ source that is
+// added to the module target (see CLAUDE.md §SWELL dialog resources / README).
+//
+// IDD_BANK_PANEL is a bare child dialog with no controls: the bank_panel shell
+// owns every pixel and draws the sample grid with LICE in WM_PAINT. It is created
+// as a child (WS_CHILD) so REAPER's docker can reparent it into a dock.
+
+#include "resource.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+IDD_BANK_PANEL DIALOG DISCARDABLE 0, 0, 400, 300
+STYLE WS_CHILD
+FONT 8, "MS Shell Dlg"
+BEGIN
+END