fix: add special hyphenation callback for Chinese script in PDF font registration

apps/web/vite.config.ts

@@ -58,6 +58,7 @@ export default defineConfig({
 
 	server: {
 		host: true,
+		strictPort: true,
 		port: Number.parseInt(process.env.PORT ?? "3000", 10),
 	},
 

packages/pdf/src/hooks/use-register-fonts.test.ts

@@ -44,6 +44,7 @@ describe("registerFonts", () => {
 
 	it("registers CJK PDF fallbacks for normal and italic text styles", async () => {
 		const registerSpy = vi.spyOn(Font, "register").mockImplementation(() => {});
+		vi.spyOn(Font, "registerHyphenationCallback").mockImplementation(() => {});
 		const cjkFallbackSource = getWebFontSource("Noto Serif SC", "400", false);
 		const { registerFonts } = await import("./use-register-fonts");
 
@@ -71,6 +72,7 @@ describe("registerFonts", () => {
 
 	it("uses the full CJK font source for synthetic italic variants when the CJK font is primary", async () => {
 		const registerSpy = vi.spyOn(Font, "register").mockImplementation(() => {});
+		vi.spyOn(Font, "registerHyphenationCallback").mockImplementation(() => {});
 		const cjkFallbackSource = getWebFontSource("Noto Serif SC", "400", false);
 		const { registerFonts } = await import("./use-register-fonts");
 

packages/pdf/src/hooks/use-register-fonts.ts

@@ -65,6 +65,11 @@ const resolvePdfTypography = (typography: Typography): Typography => {
 };
 
 export const registerFonts = (typography: Typography): PdfTypography => {
+	Font.registerHyphenationCallback((word) => {
+		if (word.match(/\p{Script=Han}/u)) return word.split("").flatMap((l) => [l, ""]);
+		return [word];
+	});
+
 	const pdfTypography = resolvePdfTypography(typography);
 	const bodyFontFamily = pdfTypography.body.fontFamily;
 	const headingFontFamily = pdfTypography.heading.fontFamily;