The native Popover always renders its content (the vertical slider), so the
slider's value label is in the DOM even when closed, and opening is driven by
the browser's declarative popovertarget invoker (not simulated by jsdom on
click). Update the tests to scope value assertions to the trigger and drive
open via showPopover(), matching Popover.svelte.test.ts.
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Implementation of the Popover analog replacing one from bits-ui.
Remove bits-ui dependency.