feat(pdf): roll out shared RTL layout to all templates

Introduce createRtlStyleHelpers and a single rtl flag on RenderProvider,
migrate every template page to mirrored layout styles, and rename
alignRight to alignEnd. Fix plain rich text rendering via PdfText
paragraph renderers and map legacy Times New Roman to Times-Roman.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/utils/src/locale.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { defaultLocale, isLocale } from "./locale";
+import { defaultLocale, isLocale, isRTL } from "./locale";
 
 describe("defaultLocale", () => {
 	it("is en-US", () => {
@@ -40,3 +40,16 @@ describe("isLocale", () => {
 		expect(isLocale([])).toBe(false);
 	});
 });
+
+describe("isRTL", () => {
+	it.each([
+		["ar-SA", true],
+		["he-IL", true],
+		["fa-IR", true],
+		["en-US", false],
+		["en-GB", false],
+		["fr-FR", false],
+	])("returns %s → %s", (locale, expected) => {
+		expect(isRTL(locale)).toBe(expected);
+	});
+});

packages/utils/src/locale.ts

@@ -84,6 +84,6 @@ const RTL_LANGUAGES = new Set([
 ]);
 
 export function isRTL(locale: string): boolean {
-	const language = locale.split("-")[0].toLowerCase();
+	const language = locale.split("-")[0]?.toLowerCase() ?? "";
 	return RTL_LANGUAGES.has(language);
 }