* perf(app): make diff line wrapping responsive on large changes
Wrapping eagerly shaped every expanded line before the viewport could paint. Estimate off-screen heights and measure rows as they enter the window, preserving the scroll anchor as geometry becomes exact. Add shared layout and browser benchmarks to track toggle latency and shaping cost.
* fix(app): preserve wrapped diff anchors across bounded relayouts
Resizing can move the viewed row outside the old materialization window. Keep its estimated wrap geometry available to anchor resolution, and measure the anchored row in the same layout pass so inaccurate estimates cannot discard the exact fragment or pixel offset.
Mohamed Boudra
50623965b4