Show optional X/Y/Z distances in measurement overlays (#1422)

Measure can show the world-axis components alongside the total distance, with a Graphics preference to turn them off.

Co-authored-by: cronos <[email protected]>
Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

docs/book/src/guide/sketching.md

@@ -243,6 +243,11 @@ retain trailing zeros. Component/canvas distance controls and inspection, parts-
 and flat-pattern measurements follow design units too; parameter expressions and metric
 standard names retain their explicit authored units.
 
+Measure shows the currently selected distance (centre, minimum or maximum) and separate X, Y and Z
+distances on the canvas. The component dimensions follow the world axes and remain visible
+until the Measure dialog closes. To hide these extra lines and labels, turn off
+**Preferences > Graphics > Show X/Y/Z distances**. The choice is saved between runs.
+
 ### Reviewing mirror, pattern, and offset results
 
 Mirror, rectangular/circular Pattern, and Offset show the active selection step in their