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Miguel Angel Simon Sierra
477916cbe2
The timeline track key is a fractional z-order sort key: an expanded sub-composition child gets `host.track + n / (siblings + 2)`. The undo history entry for the eye toggle interpolated that key directly, so hiding an expanded child recorded "Hide track 0.16666666666666666". Give the key-to-display-row conversion a single owner (timelineTrackDisplay.ts) and route both the track header labels and the history label through it, so the two cannot drift apart again. The raw key still routes the callbacks and lookups that need it. Adds a regression test that toggles a track keyed 1 / 6; a test on track 0 formats cleanly and proves nothing.