fix(dimension): an edited dimension keeps its layer's linetype

A dimension loaded from a file draws from its baked *D block, whose
lines are ByBlock and so take the dimension's linetype (ByLayer: the
layer's). Any edit - text colour, MATCHPROP, a grip - drops that block
and the dimension draws live, where a style with no DIMLTYPE/DIMLTEX1/2
drew solid: an edited dimension on a dashed layer turned solid (#898).
None or ByBlock now takes the dimension's own linetype, ByLayer its
layer's.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/scene/view/render.rs

@@ -3383,7 +3383,7 @@ pub(in crate::scene) fn linetype_name_for<'a>(document: &'a CadDocument, e: &'a
     linetype_name_for_viewport(document, e, None)
 }
 
-pub(in crate::scene) fn linetype_name_for_common_viewport<'a>(
+pub(crate) fn linetype_name_for_common_viewport<'a>(
     document: &'a CadDocument,
     common: &'a codec::entities::EntityCommon,
     viewport: Option<Handle>,