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Build translation, directionality, plural rules, and locale fallback into the product before translated text starts breaking the interface.

Measure frames on representative hardware, separate UI and raster work, and fix the actual bottleneck instead of guessing.

Choose unit, widget, and integration tests around behavior that matters, then keep them fast and deterministic.

A decision guide for local UI state, shared application data, persistent preferences, and recoverable screen state.

Separate screens, presentation logic, and data access without burying a small Flutter project in unnecessary layers.