Radial dimensions: text on the line, a short leader when it moves out

The text of a radius or diameter constraint sits on its dimension line,
which breaks around it, and no centre mark is drawn while that line is
there. Text that no longer fits inside moves beside the circle at the end
of a short leader that leaves the rim, elbows and hooks under the text,
with the arrowheads keeping the circle. A dynamic dimension now keeps
only its text at a constant screen size; arrowheads and extension lines
keep the style's size in drawing units.

Co-Authored-By: Claude Opus 5 <[email protected]>

src/app/command_driver.rs

@@ -1844,6 +1844,7 @@ impl OpenCADStudio {
                             dov::DIMEXO,
                             dov::DIMEXE,
                             dov::DIMASZ,
+                            dov::DIMTAD,
                             dov::DIMTIH,
                             dov::DIMTOH,
                         ] {