fix(render): use #set align() instead of #align()[] for reliable horizontal text alignment

In Typst 0.14, #align(center)[text] wrapping did not work reliably
inside the #context + measure() pattern used for vertical centering
in fixed-page text boxes. Changed to #block(width: 100%)[#set align(...)]
which correctly propagates alignment through the layout pipeline.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Yonghye Kwon <developer.0hye@gmail.com>

Author: developer0hye

crates/office2pdf/src/parser/pptx_shape_style_tests.rs

@@ -507,8 +507,8 @@ fn test_split_textbox_preserves_alignment() {
     // Verify Typst output contains #align(center)
     let typst_output = crate::render::typst_gen::generate_typst(&doc).unwrap();
     assert!(
-        typst_output.source.contains("#align(center)"),
-        "Typst output should contain #align(center) for centered paragraph, got:\n{}",
+        typst_output.source.contains("#set align(center)"),
+        "Typst output should contain #set align(center) for centered paragraph, got:\n{}",
         typst_output.source,
     );
 }

crates/office2pdf/src/render/typst_gen.rs

@@ -1086,14 +1086,16 @@ fn generate_fixed_text_paragraph(out: &mut String, para: &Paragraph) -> Result<(
         Some(Alignment::Center) | Some(Alignment::Right) | Some(Alignment::Left)
     );
 
+    // Use #block(width: 100%)[#set align(...); content] to ensure alignment
+    // works reliably inside #context + measure() vertical centering.
     if use_align {
         let align_str = match alignment {
             Some(Alignment::Left) => "left",
             Some(Alignment::Center) => "center",
             Some(Alignment::Right) => "right",
             _ => "left",
         };
-        let _ = write!(out, "#align({align_str})[");
+        let _ = write!(out, "#block(width: 100%)[#set align({align_str})\n");
     }
 
     generate_runs_with_tabs(out, &para.runs, style.tab_stops.as_deref());