fix(draw_kit): reclaim 4x waveform oversample; relocate waveformColumnCount to component_geometry

kWaveformOversample set to 1 (was 4) — overbinning produced byte-identical pixels because columnMinMax exact partition already makes the draw gap-free. Comments credit columnMinMax, not oversampling.

src/bank_panel.cpp

@@ -13,8 +13,8 @@
 //     LICE-drawn named-banks tab-page region below (one tab per named bank, an
 //     overflow/scroll strip), and two full-height toggles that collapse the split.
 //     Each region reuses the M5 grid render loop (waveform thumbnails / empty state).
-//   * per-sample PCM read via PCM_source fed to peaks::computeEnvelope, oversampled
-//     (kWaveformOversample bins per drawn pixel column) for the FA3 gap-free draw.
+//   * per-sample PCM read via PCM_source fed to peaks::computeEnvelope, one bin per
+//     drawn pixel column; drawWaveform's gap-free render comes from peaks::columnMinMax.
 //   * an in-memory thumbnail cache keyed by (sample id, draw width, bank generation).
 //   * id-keyed bank management (create / rename / delete / evacuate / activate) and
 //     sample move/copy — driven from a tab context menu and a drag — against the B1
@@ -1350,10 +1350,10 @@ void drawRegionGrid(LICE_IBitmap* bmp, const RECT& region, bool isBanks,
     // BankIndex insertion order. Selection/focus are keyed by the occupied-ordinal (selection
     // space); a slot maps back to its ordinal via selectionForSlot.
     const RegionDisplay disp = regionDisplay(region, isBanks, reg);
-    // FA3 anti-alias: thumbnails are computed OVERSAMPLED — kWaveformOversample bins per
-    // drawn pixel column — and drawWaveform collapses them per column (peaks::columnMinMax)
-    // so steep transients render as true full-height spans. computeThumbnail clamps the
-    // request to the frame count.
+    // FA3 gap-free: request one bin per drawn pixel column; drawWaveform's
+    // peaks::columnMinMax exact partition makes every column gap-free — overbinning
+    // produces byte-identical pixels at higher memory/CPU cost. computeThumbnail clamps
+    // the request to the frame count.
     const int binWidth = kWaveformOversample *
                          waveformColumnCount(KitBox{0, 0, kGrid.cellWidth, kGrid.cellHeight});
     for (const SlotCellRect& r : disp.slotRects) {