Refactor GridWidget and other UI components to use the pre-computed layout from
App instead of re-creating it on every render. This improves performance and
ensures consistency.
- Update GridWidget to take a reference to GridLayout
- Update GridWidget::new and render to use the provided layout
- Update App::cmd_context and other call sites to pass the layout
- Update tests to provide the layout to GridWidget
Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/gemma-4-26B-A4B-it-GGUF:UD-Q5_K_XL)
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