Tiny World Settings

Settings live in tiny-world-builder.html inside #render-modal.

Keep settings changes compatible with the existing static single-file app:

• Preserve data-settings-tab values (app, rendering, world, materials, environment, crowd, ai) unless every command-palette and settings caller is updated in the same change.
• Preserve existing control IDs. The settings setup code binds controls by getElementById, so moving controls between sections is safe but renaming IDs is not.
• selectSettingsTab(name) must guard unknown names and update all tab and panel state together: .active, aria-selected, tab tabIndex, panel .active, and panel hidden.
• Settings tabs should remain real role="tab" buttons inside a role="tablist" and support click plus Arrow/Home/End keyboard navigation.
• Panels should be role="tabpanel" with stable IDs and aria-labelledby pointing at the matching tab.
• Settings search should be a thin UI layer over the existing tab/panel wiring: never rename controls for search, keep hidden rows reversible when the query clears, and route automatic tab changes through selectSettingsTab().
• Search result counts may be shown inside tab buttons, but keep the tab's data-settings-tab value, role, keyboard navigation, and accessible label in sync.

Structure rules: