[Bug] Windows WebView stuck on chrome-error after preview_stop/preview_start cycle with orphaned processes

Bug Description

# Windows: Preview tool WebView stuck on chrome-error after preview_stop/preview_start cycle ## Environment - OS: Windows 11 (DESKTOP-U30T4EP) - Claude Desktop: 1.5354.0.0 - claude-code CLI: 2.1.121 - Project: Next.js 16.3.0-canary.5 + Turbopack - Runtime: bun 1.3.11 via mise (also tested with node_modules/.bin/next.exe directly) ## Issues ### 1. mcp__Claude_Preview WebView gets stuck on chrome-error://chromewebdata/ After calling preview_stop then preview_start (even with a new serverId), the WebView refuses to reach localhost:3000 (and 127.0.0.1:3000). The dev server itself is verified reachable: Invoke-WebRequest http://localhost:3000/en returns 200 with full HTML (127KB). Only the embedded WebView is broken. window.location.href = 'http://localhost:3000/en' from preview_eval has no effect — location.href keeps reporting chrome-error://chromewebdata/. The first preview_start of a session works correctly. Only restarts fail. ### 2. preview_stop leaves orphaned descendant processes On Windows, preview_stop only terminates the wrapper process (next.exe shim or bun.exe). The actual node-based dev server and its 5-7 worker subprocesses (~1.5 GB total) survive as orphans, holding port 3000 and file handles under .next/dev/cache/turbopack/. Subsequent preview_start then hits "port in use" or cache lock contention. Mac doesn't exhibit either issue with identical Claude Code / Next.js versions. ## Repro 1. macOS works fine. Windows-only. 2. bun dev (or next dev) for any Next.js 16 canary project 3. mcp__Claude_Preview__preview_start → load page → works 4. mcp__Claude_Preview__preview_stop 5. mcp__Claude_Preview__preview_start again 6. WebView stuck on chrome-error; orphaned node processes consuming ~1.5GB ## Expected - preview_stop should terminate the entire process tree - WebView should recover and load the new server's URL

Environment Info

• Platform: win32
• Terminal: windows-terminal
• Version: 2.1.121
• Feedback ID: a5c90781-6004-442e-8b58-48af629ac42d

Errors

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