Loop-crossfade-ux review fixes: parked-drag no longer fakes LOOP OFF, waveform label contrast fixed, hover memoizes its bank read

Also corrects the cap-area, em-dash, glyph-overhang and heuristic-comment findings noted in review.

src/shell/instrument/editor_input_waveform.cpp

@@ -64,11 +64,12 @@ bool ReaSamplerEditor::mouseDownWaveform(const FaceLayout& fl, int x, int y) {
     // keeps a cap apart from ITS OWN column; this is the cross-affordance case on top of that).
     // resolveWaveformClaim (spline_edit.h) is the ONE arbitration: it measures each claimant's
     // own NOMINAL target area and lets the smallest hit win, since a fixed check order shadows
-    // whichever one loses the tie — this seam regressed twice from exactly that fix. Giving
-    // every mark a cap changed WHICH mark the cap slot resolves to, not the slot's nominal area
-    // (every cap is one markerHandleRect) and not the ordering cap < node < column, so the
-    // arbitration itself is unchanged. Never add here (kAdd is only tried once nothing else has
-    // claimed the click, below).
+    // whichever one loses the tie — this seam regressed twice from exactly that fix. Giving every
+    // mark a cap changed WHICH mark the cap slot resolves to AND the slot's own nominal area
+    // (every cap is one markerHandleRect, so it moved from the old clipped-actual measure — 60 at
+    // frame 0 — to the nominal 110); the `cap < node < column` ordering held anyway, because 110
+    // is still under the node's fixed pick-box area. Never add here (kAdd is only tried once
+    // nothing else has claimed the click, below).
     WaveformClaim node;
     if (envNodeHit.hit) {
         constexpr std::int64_t side = 2 * kNodeGrabRadius + 1;