Bake window: derived note lengths carry exact durations, not ladder rungs — a long take is no longer cut at 384 beats

Hold keeps its picker. Also: one home for the %-fold, duration-ordered Hold travel, and a corrupt tail degrades to absent rather than fabricating one.

src/core/instrument/ui/sample_chrome.h

@@ -19,9 +19,11 @@ struct ChromeRects {
     Rect toolbar;     // full-width top row
     Rect title;       // the title text slot: the toolbar left of the control run
     // The bake Hold cell. Its width is RESERVED unconditionally even though the control is
-    // only load-bearing for a looped Gate sound (bake_plan.h's bakeWindowNeedsHold): the run
-    // is right-anchored, so laying it out conditionally would slide Bake and Preview out from
-    // under the pointer whenever a loop is dialled in or out.
+    // only drawn for a looped Gate sound (bake_plan.h's bakeWindowNeedsHold). It is the
+    // LEFTMOST member of the right-anchored run, so no other member moves either way — what
+    // the reservation buys is a title slot that holds still: dialling a loop in or out would
+    // otherwise re-measure and re-ellipsize the capture name. The cost is ~62 px of dead
+    // toolbar in the common non-looped case.
     Rect holdCell;    // ---- the right-anchored run, left to right ----
     Rect holdKnob;
     Rect holdLabel;