fix(text): preserve stream order for RTL-placed design-tool PDFs

src/integration/text/rtl-placed-text.test.ts

@@ -0,0 +1,33 @@
+/**
+ * Regression test for reversed text extraction from design-tool PDFs.
+ *
+ * Some design tools (e.g. Figma, Canva) export PDFs where characters are
+ * placed RIGHT-TO-LEFT in user space via TJ positioning adjustments, even
+ * though the text is LTR (English). The font has near-zero glyph widths,
+ * and all positioning is done via positive TJ adjustments (which move the
+ * pen left). Characters appear in correct reading order in the content
+ * stream, but their x-positions decrease.
+ *
+ * The line grouper sorts characters by x-position (left to right), which
+ * reverses the correct reading order for these PDFs.
+ */
+import { PDF } from "#src/api/pdf";
+import { loadFixture } from "#src/test-utils";
+import { describe, expect, it } from "vitest";
+
+describe("RTL-placed LTR text (design-tool PDFs)", () => {
+  it("extracts text in correct reading order, not reversed", async () => {
+    const bytes = await loadFixture("text", "rtl-placed-ltr-text.pdf");
+    const pdf = await PDF.load(bytes);
+    const page = pdf.getPage(0);
+
+    expect(page).not.toBeNull();
+
+    const pageText = page!.extractText();
+
+    // The fixture has lorem ipsum text placed right-to-left via TJ adjustments.
+    // Text should read correctly, not reversed.
+    expect(pageText.text).toContain("Lorem ipsum dolor sit amet consectetur");
+    expect(pageText.text).not.toContain("rutetcesnoc tema tis rolod muspi meroL");
+  });
+});