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.

CMakeLists.txt

@@ -36,6 +36,15 @@ target_include_directories(peaks PUBLIC src)
 add_library(capture_paths STATIC src/capture_paths.cpp)
 target_include_directories(capture_paths PUBLIC src)
 
+# ---------------------------------------------------------------------------
+# 2c) Pure bank-grid layout — NO REAPER, NO SWELL. Grid tiling math (panel WxH +
+#     cell size + N -> cell rects, wrapping, partial last row) and the thumbnail
+#     cache key for the docked bank_panel (M5). Split out so the layout logic is
+#     unit-tested outside the DAW; the panel shell (SWELL/LICE/PCM) is DAW-verified.
+# ---------------------------------------------------------------------------
+add_library(bank_grid STATIC src/bank_grid.cpp)
+target_include_directories(bank_grid PUBLIC src)
+
 # ---------------------------------------------------------------------------
 # 3) Standalone tests for the pure modules (run without launching REAPER).
 # ---------------------------------------------------------------------------
@@ -52,21 +61,39 @@ add_executable(capture_paths_tests tests/test_capture_paths.cpp)
 target_link_libraries(capture_paths_tests PRIVATE capture_paths)
 add_test(NAME capture_paths_tests COMMAND capture_paths_tests)
 
+add_executable(bank_grid_tests tests/test_bank_grid.cpp)
+target_link_libraries(bank_grid_tests PRIVATE bank_grid)
+add_test(NAME bank_grid_tests COMMAND bank_grid_tests)
+
 # ---------------------------------------------------------------------------
 # 4) The REAPER extension — a loadable module (dlopen'd by REAPER, not linked).
 # ---------------------------------------------------------------------------
+# LICE sources the bank_panel draws with: lice.cpp (LICE_SysBitmap, FillRect,
+# Clear, Blit) + lice_line.cpp (Line, DrawRect). lice_line.cpp's bezier helpers
+# call LICE_FillCircle from lice_arc.cpp, so that TU is required to link even
+# though the panel draws no arcs. LICE routes GDI through native Win32 or, on
+# mac/linux, the host SWELL (SWELL_PROVIDED_BY_APP).
+set(LICE_SRC
+    ${WDL_INC}/lice/lice.cpp
+    ${WDL_INC}/lice/lice_line.cpp
+    ${WDL_INC}/lice/lice_arc.cpp
+)
+
 add_library(reaper_reasampler MODULE
     src/main.cpp
     src/capture.cpp
     src/persist.cpp
+    src/bank_panel.cpp
+    ${LICE_SRC}
 )
-target_link_libraries(reaper_reasampler PRIVATE bank_model capture_paths)
+target_link_libraries(reaper_reasampler PRIVATE bank_model capture_paths peaks bank_grid)
 target_include_directories(reaper_reasampler PRIVATE ${SDK_INC} ${WDL_INC})
 set_target_properties(reaper_reasampler PROPERTIES PREFIX "" OUTPUT_NAME "reaper_reasampler")
 
 if(WIN32)
-    # Native Win32. REAPER provides nothing extra to link.
-    # Dialog resources return with the docked bank_panel (Milestone 5).
+    # Native Win32. REAPER provides nothing extra to link. The bank_panel dialog
+    # template (M5) is compiled from src/resource.rc by the platform RC compiler.
+    target_sources(reaper_reasampler PRIVATE src/resource.rc)
 
 elseif(APPLE)
     # macOS: use REAPER's OWN SWELL at runtime via the modstub.
@@ -75,7 +102,10 @@ elseif(APPLE)
     target_compile_definitions(reaper_reasampler PRIVATE SWELL_PROVIDED_BY_APP)
     target_link_libraries(reaper_reasampler PRIVATE "-framework AppKit")
     set_target_properties(reaper_reasampler PROPERTIES SUFFIX ".dylib")
-    # Dialog: run SWELL resgen once (see README) and add the generated source.
+    # bank_panel dialog (M5): SWELL can't read a Win32 .rc directly. Run resgen
+    # once to turn src/resource.rc into a C++ source, then add it here:
+    #   php ${WDL_INC}/swell/mac_resgen.php src/resource.rc
+    # target_sources(reaper_reasampler PRIVATE src/resource.rc_mac_dlg.h)  # generated
 
 else()
     # Linux: REAPER's libSwell.so is used at runtime via the generic modstub.
@@ -83,5 +113,8 @@ else()
     target_sources(reaper_reasampler PRIVATE ${SWELL}/swell-modstub-generic.cpp)
     target_compile_definitions(reaper_reasampler PRIVATE SWELL_PROVIDED_BY_APP)
     set_target_properties(reaper_reasampler PROPERTIES SUFFIX ".so")
-    # Dialog: run SWELL resgen once (see README) and add the generated source.
+    # bank_panel dialog (M5): reuse the macOS resgen output (see README /
+    # CLAUDE.md §SWELL dialog resources), then add the generated source:
+    #   php ${WDL_INC}/swell/mac_resgen.php src/resource.rc
+    # target_sources(reaper_reasampler PRIVATE src/resource.rc_mac_dlg.h)  # generated
 endif()