feat: legible ReaSampler 9000 editor — bigger knobs, ms time constants, per-ring double-click reset, and an antialiased draw pass

src/core/instrument/ui/knob_deck.h

@@ -22,11 +22,13 @@
 
 namespace reasampler::instrument::ui {
 
-// Fixed deck metrics, exposed so the shell and tests agree.
-inline constexpr int kDeckCellW = 48;         // one knob cell
-inline constexpr int kDeckCellH = 58;
-inline constexpr int kDeckKnobSize = 28;      // knob diameter inside the cell
-inline constexpr int kDeckCellLabelH = 12;    // the Micro label band under the knob
+// Fixed deck metrics, exposed so the shell and tests agree. The cell/knob/label sizes were
+// raised together for legibility at high pixel densities; the editor's floor width
+// (sample_bands) is what absorbs the wider cells, so the two move as a pair.
+inline constexpr int kDeckCellW = 60;         // one knob cell
+inline constexpr int kDeckCellH = 74;
+inline constexpr int kDeckKnobSize = 40;      // knob diameter inside the cell
+inline constexpr int kDeckCellLabelH = 16;    // the label band under the knob
 inline constexpr int kDeckCaptionH = 20;      // the group caption row
 inline constexpr int kDeckToggleH = 18;       // compact toggle segment height
 inline constexpr int kDeckGroupPadX = 6;      // group box horizontal inner padding
@@ -39,7 +41,7 @@ inline constexpr int kDeckRadioSize = 12;     // the caption-row corner radio sq
 // The knob cell's INNER dial: a concentric sub-disc that edits a second, related value while
 // the outer ring keeps editing the cell's own. Geometry only — WHICH cells carry one is
 // deck_groups' call, so a cell without an inner value simply resolves an inner hit as a knob.
-inline constexpr int kDeckInnerDialSize = 14;
+inline constexpr int kDeckInnerDialSize = 20;
 // One group box: padding + caption + gap + cell row + padding.
 inline constexpr int kDeckGroupH =
     kDeckGroupPadY + kDeckCaptionH + kDeckCaptionGap + kDeckCellH + kDeckGroupPadY;
@@ -145,4 +147,17 @@ struct DeckHit {
 // the caption-row corner radio. Everything else — fence, padding, outside — misses.
 DeckHit hitTestDeck(const DeckLayout& layout, int x, int y);
 
+// The knob FACE a point lands on. id -1 is a miss.
+struct DeckFaceHit {
+    int id = -1;
+    bool inner = false;  // inside the concentric inner disc
+};
+
+// Resolved against the drawn CIRCLES, not the cell: a reset is aimed at a dial, so the label
+// band and the cell margins must miss where a drag grab deliberately does not. Both radii are
+// boundary-EXCLUSIVE, one rule for both rings — a point exactly on the inner radius is an
+// outer-ring hit, one exactly on the outer radius is a miss. Whether a cell actually carries an
+// inner value is deck_groups' call, exactly as with DeckHit::inner.
+DeckFaceHit hitTestKnobFace(const DeckLayout& layout, int x, int y);
+
 }  // namespace reasampler::instrument::ui