svelte-check on the new dev-push CI surfaced 11 type errors. Cause:
TrackMenuItem typed `icon` as Svelte 5's runes-mode `Component<...>`,
but Lucide-svelte ships class-based components whose type is
`ComponentType<SvelteComponent<...>>`. Switch the prop type to match
Lucide's actual export shape.
Also drop the redundant role="separator" on TrackMenuDivider — <hr>
already implies role=separator (svelte-check warning).
The remaining a11y warnings (tabindex on role=menu/dialog elements,
key-handler-with-click) are pre-existing in FlagPopover and surface
on the new dev-push run because svelte-check now sees them. They're
warnings not errors, so they don't block CI; address as a follow-up.
bvandeusen