Small user interface improvements

[maxpatiiuk]

• Add h-full to Button.Icon inside of tall <tr>s
  Review all places in Specify for an issue like this: Grid view collapse button should extend to the full height of the item #1993
• https://www.smashingmagazine.com/2022/08/error-messages-ux-design/
• Add meta viewport tag (for mobile) - https://developer.mozilla.org/en-US/docs/Web/HTML/Viewport_meta_tag
• Remove/review all usages of "px" unit (use rem or other dynamic units when possible). px should probably only be used for border size
• Consider replacing position:absolute with overlapping grid cells (https://pqina.nl/blog/css-grid-position-absolute-alternative/). Research the performance and other implications