Android Design System, Component Gallery, Dummy Data & Signing

Self-contained module governing four core pillars of the Android development cycle:

1. Design Language & Window Inset Discipline (Material Design 3 or user-specified design language, status bar, cutout, bottom navigation bar, and multi-screen/density clipping prevention)
2. Themed Shared Component Gallery (visual in-app showcase of all shared components across Light/Dark themes and states)
3. Deterministic Dummy / Seed Data (reusable development and QA fixtures so every screen and gallery component always has rich data to test)
4. Signing Key Conventions (shared debug keystore across builds/worktrees + git-excluded production signing via environment variables)

When to Use

• Bootstrapping a new Android app or design system module (Wave 0 / core:designsystem)
• Adding or modifying shared UI components, screens, or themes
• Creating realistic dummy/seed data for development, Compose previews, and live-device interactive testing
• Configuring or auditing build.gradle.kts signing configs (debug vs. release)

1. Design Language, Screen Matrix & Window Insets

1.1 Always Use an Explicit Design Language