* Update our cancel icon
The cancel icon we're using in the app has drifted out of sync with the ones used in our designs. We also had two identical-looking icons, so this consolidates them into one.
I've simultaneously updated our chevron icons, since in the case of the 'jump to unread' timeline button, it became clear that the weight of the new close icon did not match the thinner chevron.
* Don't squish bottom/top-aligned tooltips near the edge of the screen
* Close the timeline panel when returning to the fullscreen timeline view
* Add layout switching capabilities to ElementCall
* Bring the room header in line with the group call designs
* Bring the PiP header in line with the group call designs
* Fix lints
* Clarify tooltip CSS calculations
* Test PipView
* Expand RoomHeader test coverage
* Test PipView more
* Revert "Prevent new composer from overflowing from non-breakable text (#8829)"
This reverts commit 57dff8131c.
* Revert "Fix scroll jump issue with the composer (#8791)"
This reverts commit 5167521ea4.
* Revert "Fix scroll jump issue with the composer (#8788)"
This reverts commit f568a76dc6.
* Revert "Revert link color change in composer (#8784)"
This reverts commit aedbeb2995.
* Revert "Improve composer visiblity (#8578)"
This reverts commit f14374a51c.
