refactor(text): parse single-line ATTRIB text via acadrust

Route single-line attribute text through the same acad_text_encode path
TEXT uses (acadrust parse_plain_text, re-encoded for the stroke
tessellator). Multi-line attributes already flow through layout_mtext
(acadrust). No visible change — attribute text with %% codes rendered
correctly before via the local tokenizer; this shares the one parser.
TOLERANCE cells and complex-linetype text still use the local tokenizer
(specialized paths that rarely carry %% codes).

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/entities/attribute.rs

@@ -278,6 +278,9 @@ fn build_attr_truck(input: AttrTextInputs<'_>, document: &acadrust::CadDocument)
             anchor_f64[0] - (anchor_local_x as f64 * cos_r - local_y_for_line as f64 * sin_r),
             anchor_f64[1] - (anchor_local_x as f64 * sin_r + local_y_for_line as f64 * cos_r),
         ];
+        // Parse `%%` codes through acadrust (same as TEXT), re-encoded for the
+        // stroke tessellator, so attribute text shares the one parser.
+        let encoded = crate::entities::text::acad_text_encode(line);
         let (strokes, fill_tris) = lff::tessellate_text_ex(
             [0.0, 0.0],
             input.height as f32,
@@ -285,7 +288,7 @@ fn build_attr_truck(input: AttrTextInputs<'_>, document: &acadrust::CadDocument)
             width_factor,
             oblique_angle,
             &resolved.font_name,
-            line,
+            &encoded,
         );
         strokes_all.push(TextStroke {
             strokes,

src/entities/text.rs

@@ -71,7 +71,7 @@ pub struct TextPlacement {
 /// inline grammar: specials arrive resolved to Unicode, and `%%u`/`%%o`
 /// underline/overline become `\L…\l` / `\O…\o` decoration markers. This keeps
 /// TEXT parsing in acadrust rather than OCS's own tokenizer.
-fn acad_text_encode(value: &str) -> String {
+pub(crate) fn acad_text_encode(value: &str) -> String {
     use acadrust::entities::mtext_format::parse_plain_text;
     let doc = parse_plain_text(value);
     let mut out = String::new();