Fix two Windows bugs: Chrome path and token save

1. Chrome path: use path.join() instead of template string backslashes
   which get mangled by Bun's string interpolation on Windows
2. Token save: replace Bun.write with writeFileSync — Bun.write is
   async and may not flush before process.exit() on Windows

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: baixianger

index.ts

@@ -88,12 +88,13 @@ async function ensureChrome(cdpUrl: string): Promise<void> {
     if (userPath) {
       bin = userPath;
     } else {
+      const chromeSub = join("Google", "Chrome", "Application", "chrome.exe");
       const defaults: Record<string, string[]> = {
         darwin: ["/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"],
         win32: [
-          `${process.env.PROGRAMFILES}\\Google\\Chrome\\Application\\chrome.exe`,
-          `${process.env["PROGRAMFILES(X86)"]}\\Google\\Chrome\\Application\\chrome.exe`,
-          `${process.env.LOCALAPPDATA}\\Google\\Chrome\\Application\\chrome.exe`,
+          ...(process.env.PROGRAMFILES ? [join(process.env.PROGRAMFILES, chromeSub)] : []),
+          ...(process.env["PROGRAMFILES(X86)"] ? [join(process.env["PROGRAMFILES(X86)"], chromeSub)] : []),
+          ...(process.env.LOCALAPPDATA ? [join(process.env.LOCALAPPDATA, chromeSub)] : []),
         ],
         linux: ["google-chrome", "google-chrome-stable", "chromium-browser"],
       };

lib/auth.ts

@@ -7,7 +7,7 @@
  *   2. Manual: user pastes token from browser devtools
  */
 
-import { existsSync, mkdirSync } from "fs";
+import { existsSync, mkdirSync, writeFileSync } from "fs";
 import { homedir } from "os";
 import { join } from "path";
 
@@ -25,7 +25,7 @@ export interface TokenData {
 
 /** Save token to disk */
 export function saveToken(data: TokenData): void {
-  Bun.write(TOKEN_PATH, JSON.stringify(data, null, 2));
+  writeFileSync(TOKEN_PATH, JSON.stringify(data, null, 2));
 }
 
 /** Load saved token */