- Fix State timerange adjustment for multiple timelines
- Fix grid layout for detail panels
- Style panels consistently
- Simplify file-reader html

Bug: v8:10644
Change-Id: I277d88e2deb2bf71b0204034f6e63ea35f85a791
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2485812
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70653}