flutter-building-layouts

What problem does it solve? Flutter developers frequently encounter render exceptions such as unbounded constraint errors and overflow warnings when composing UI layouts, because the constraint system (constraints go down, sizes go up, parent sets position) is not intuitive. ## Core Features & Use Cases - Constraint System Guidance: Explains how constraints flow down the widget tree and how to avoid unbounded constraint exceptions in flex boxes and scrollables. - Structural Widget Selection: Directs the choice of Row, Column, Expanded, Flexible, Container, Stack, and SizedBox based on the required spatial arrangement. - Adaptive and Responsive Design: Uses LayoutBuilder and conditional rendering to adapt layouts across mobile, tablet, and desktop form factors. - Use Case: When a ListView inside a Column throws an unbounded height exception, wrap the ListView in Expanded so it is constrained to the remaining vertical space. ## Quick Start Ask the assistant to build a responsive Flutter page layout with a sidebar on wide screens and a bottom navigation bar on mobile, following the constraint rules.