NavigationBar

Renders a Material 3 navigation bar with one entry per item declared via items (built with item). An item is selected when its id equals selectedItemId; the selected item's icon is drawn in its filled variant, the others outlined, and its label is centered under the icon (or omitted when not given). Tapping an item flips selectedItemId locally on the client (no server round trip needed for the highlight to move) — tapping the already-selected item still fires everything again. The bar itself is not clickable and fires no display trigger; it only tracks the selected item, so performing the actual navigation is up to the events wired to the item clicks. Dispatches onNavigationBarItemClick(itemId) when an item is tapped, so events can be wired per item.

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