Improve Icon Button consistency (#9250)
* * update icon buttons
* add image editor specific icon button
* tweak hover
* margin tweak
* add changeset
* improve gr.Video button UI
* radius tweak
* ensure even spacing
* fix typechecks
* add changeset
* revert irrelevant changes
* typefix
* fix image editor buttons
* fix download link icon
* disable undo if no change events dispatched in model3d and video
* add changeset
* add iconbuttonwrapper around gallery share btn
---------
Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
