Remove white box-shadow divider from uploading status area for consistency.

Props paulwilde.
Fixes #28751.

Built from https://develop.svn.wordpress.org/trunk@29286


git-svn-id: http://core.svn.wordpress.org/trunk@29068 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid CSS: Media modal close icon should be consistent with other modals.

Props celloexpressions.
Fixes #29012.

Built from https://develop.svn.wordpress.org/trunk@29287


git-svn-id: http://core.svn.wordpress.org/trunk@29069 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: remove pencil icon from attachment hover and a bunch of unused CSS.

Fixes #28945.

Built from https://develop.svn.wordpress.org/trunk@29288


git-svn-id: http://core.svn.wordpress.org/trunk@29070 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: UI improvements to Attachment modal.

Props ryelle.
See #28844.

Built from https://develop.svn.wordpress.org/trunk@29289


git-svn-id: http://core.svn.wordpress.org/trunk@29071 1a063a9b-81f0-0310-95a4-ce76da25c4cd