The floating header wrapper is pointer-events-none (so clicks fall through its empty
area to the content below); every interactive child must re-enable pointer events.
PlexViewToggle rendered its SegmentedToggle without the pointer-events-auto wrapper the
sibling PlexScopeToggle has, so the whole Discover/Browse switch was click-dead — the
buttons rendered and were correctly wired, but no real mouse click ever reached them.
Add `className="pointer-events-auto shrink-0"` to the toggle and a regression test that
asserts the root re-enables pointer events (plus the render/onChange/hide-on-deeper-view
contract). Verified live on localdev: real clicks now switch Discover⟷Browse (?v=browse)
in both directions; a header-wide hit-test audit shows no other dead controls.
Gate: tsc/lint/knip/prettier clean, 418 vitest.
