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.github/instructions/ui.md

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+# UI Instructions
+
+## Scope
+- Applies to page/component work under `src/app`, `src/components`, and `src/features`.
+
+## Rules
+- Preserve existing design language and component primitives from `src/components/ui`.
+- Keep layouts responsive with explicit overflow control for dense views (e.g., kanban horizontal overflow).
+- Prefer composition over one-off custom widgets; reuse dialog, card, table, and form primitives.
+- Keep interaction states clear (loading, empty, error) for data-driven pages.
+- Avoid visual regressions in header/sidebar containment when introducing horizontal scroll regions.
+
+## Accessibility
+- Maintain keyboard access for dialogs, menus, and drag handles.
+- Keep meaningful `sr-only` labels for icon-only controls.