fix: escape NUL bytes in HFMASK regex (Bun blank renders) + Windows junction for studio preview links

packages/cli/src/commands/preview.ts

@@ -682,7 +682,9 @@ function linkProjectIntoStudioData(
       }
     }
     if (!existsSync(symlinkPath)) {
-      symlinkSync(dir, symlinkPath, "dir");
+      // Windows: "dir" symlinks need Developer Mode or elevation (EPERM otherwise);
+      // NTFS junctions are unprivileged and keep the live write-back the studio needs.
+      symlinkSync(dir, symlinkPath, process.platform === "win32" ? "junction" : "dir");
       createdSymlink = true;
     }
   }

packages/core/src/compiler/timingCompiler.test.ts

@@ -1,3 +1,5 @@
+import { readFileSync } from "node:fs";
+import { dirname, join } from "node:path";
 import { describe, it, expect } from "vitest";
 import {
   compileTimingAttrs,
@@ -6,6 +8,15 @@ import {
   clampDurations,
 } from "./timingCompiler.js";
 
+// Raw 0x00 bytes in the HFMASK delimiters shipped once and broke every render
+// under Bun's transpiler while behaving fine under Node (issue #2139) — only a
+// byte-level check catches that, so keep the delimiters as \x00 escapes.
+it("source contains no raw NUL bytes", () => {
+  const testPath = expect.getState().testPath ?? "";
+  const src = readFileSync(join(dirname(testPath), "timingCompiler.ts"), "latin1");
+  expect(src.includes("\x00")).toBe(false);
+});
+
 describe("compileTimingAttrs", () => {
   it("adds data-end when data-start and data-duration are present on a video", () => {
     const html = '<video id="v1" src="a.mp4" data-start="2" data-duration="5">';