Produce a technical playbook for building a {{app_type}} mobile app using Flutter, targeting the {{industry}} industry with a {{visual_style}} design language. Write in a {{tone}} tone. The playbook must include:
- Overview and Prerequisites
- 9 step-by-step plays: MVP features, user flows, project architecture, data layer, components, platform requirements, performance, testing, and app store submission
- Metrics to track and troubleshooting guide
Maximum 1800 words. Every recommendation must be specific to {{app_type}} in the {{industry}} industry. Use plain language a mid-level Flutter developer can implement. Paste any relevant background information after these instructions before running.