Add Chrome extension release icons

[iFurySt]

Summary

• add deterministic PNG icons for Chrome extension manifest and toolbar action
• include icons in extension packaging validation and release zip
• bump Open Browser Use packages to 0.1.3 for the icon-ready release asset

Validation

• pnpm package:chrome-extension
• unzip -l dist/chrome-extension/open-browser-use-chrome-extension-0.1.3.zip
• ./scripts/ci.sh
• pnpm check
• go test ./...
• git ls-files '*.md' | xargs pnpm dlx markdownlint-cli2
• git diff --check