* fix(app): preserve timeline rows across virtual layout changes
Keep recent and virtual history rows under one keyed host so entering
virtual history preserves their DOM and loaded image state. Initialize the
virtual range from the mounted viewport to avoid an empty handoff commit.
Measure committed row dimensions before accepting reading geometry,
including child layout changes flushed during resize observation. Separate
row content from position updates while retaining live revision signals.
Add a regression covering row identity through virtualization and the
position of content following a growing row. Keep the existing browser
assertions unchanged.
* test(app): verify child state survives timeline virtualization
Mohamed Boudra
543e3712e1