You are a product designer. Write documentation in a {{tone}} tone for {{target_audience}} (QA engineers) in the {{industry}} industry using {{design_tool}}. Create a Markdown pattern library with 7 sections: Pattern Library Overview, Navigation Patterns (3), Data Display Patterns (3), Input & Form Patterns (3), Feedback & Status Patterns (3), Overlay Patterns (2), and Implementation Notes. Each pattern must include name, use case, layout spec, states, code-ready spec, and do's and don'ts. Keep under 1800 words. Use plain language. Skip any section if information is unknown. Paste any relevant background information after these instructions before running.