fix: Windows Chrome extraction and debugging environment (#1088)

* windows debugging

* fixes

* fixes

* fix: handle Windows path separators in Chrome zip extraction

The zip crate's enclosed_name() normalizes paths to use backslashes on
Windows, but extract_zip used split_once('/') which only matches forward
slashes. This caused Chrome to be extracted into a nested chrome-win64/
subdirectory instead of directly into the version directory.

Also adds debug diagnostics to find_installed_chrome() (gated behind
AGENT_BROWSER_DEBUG) and better error messages when Chrome cache exists
but no binary is found.

Fixes #1076

* feat: add Puppeteer browser cache as Chrome fallback

Search ~/.cache/puppeteer/chrome/ (or PUPPETEER_CACHE_DIR) for Chrome
binaries before falling back to Playwright's cache. Puppeteer v19+
stores Chrome for Testing in this location, so users with an existing
Puppeteer install can use agent-browser without a separate install step.

* fmt

scripts/windows-debug/sync.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+RUN="$SCRIPT_DIR/run.sh"
+
+BRANCH=$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo "main")
+REMOTE_URL=$(git remote get-url origin 2>/dev/null || echo "https://github.com/vercel-labs/agent-browser.git")
+
+echo "Syncing branch '$BRANCH' on Windows instance..."
+
+"$RUN" "
+cd C:\agent-browser
+git remote set-url origin '$REMOTE_URL'
+git fetch origin
+git checkout -B '$BRANCH' 'origin/$BRANCH'
+git log -1 --oneline
+"
+
+echo ""
+echo "Branch synced. Rebuilding..."
+
+"$RUN" "
+cd C:\agent-browser
+cargo build --release --manifest-path cli\Cargo.toml
+Write-Host 'Build complete.'
+"