M4: a paragraph's base direction can be forced: Text ▸ Text direction (#1830)

Direction came from the letters only; Add right-to-left text says controls override it per paragraph (Text > Text direction, Left to right or Right to left). `TextDirection` on `ParaList`, `Bidi::of` with a base level per paragraph, `text.direction` and the three menu commands (the edited paragraphs while editing), `node.set textDirection`, the Type settings control once a right-to-left script is in the text, inspect `textDirection` / `lineDirections`, the CSS `direction`, and the `.fig` lines' `sourceDirectionality` in and out.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

crates/engine/src/dev/codegen/css.rs

@@ -307,6 +307,13 @@ fn text_decls(doc: &Document, n: &Node, tx: &figcraft_doc::TextData, t: &mut Tok
         figcraft_doc::WrapStyle::Balance => put("text-wrap", "balance".into()),
         figcraft_doc::WrapStyle::Pretty => put("text-wrap", "pretty".into()),
     }
+    // A base direction forced on every paragraph (CSS has one per element).
+    let dir = tx.paragraphs.first().map(|p| p.direction).filter(|d| tx.paragraphs.iter().all(|p| p.direction == *d));
+    match dir {
+        Some(figcraft_doc::TextDirection::Ltr) => put("direction", "ltr".into()),
+        Some(figcraft_doc::TextDirection::Rtl) => put("direction", "rtl".into()),
+        _ => {}
+    }
     match s.case {
         TextCase::Original => {}
         TextCase::Upper => put("text-transform", "uppercase".into()),