Adds `<label>`s to current page selector and bulk actions `<select>` field so that screen readers have an explicit label.

Props joedolson.
Fixes #28867.

Built from https://develop.svn.wordpress.org/trunk@29294


git-svn-id: http://core.svn.wordpress.org/trunk@29076 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: change text to "Close Media Panel" to provide context for screen readers.

Props joedolson.
Fixes #28976.

Built from https://develop.svn.wordpress.org/trunk@29295


git-svn-id: http://core.svn.wordpress.org/trunk@29077 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: improve uploader styles.

Props michalzuber, ericlewis.
See #28851.

Built from https://develop.svn.wordpress.org/trunk@29296


git-svn-id: http://core.svn.wordpress.org/trunk@29078 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: make check `box-shadow` more subtle.

See #28842.

Built from https://develop.svn.wordpress.org/trunk@29297


git-svn-id: http://core.svn.wordpress.org/trunk@29079 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE wpView:
- Fix opening the media modal on clicking Edit in Firefox.
- Fix range errors when restoring the selection bookmark in IE11 after editing a view.
See #28595.
Built from https://develop.svn.wordpress.org/trunk@29298


git-svn-id: http://core.svn.wordpress.org/trunk@29080 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: when closing the modal, automatically focus the proper attachment by reading the model's ID, which is unique.

Props adamsilverstein (for the red), wonderboymusic (for the green).
Fixes #28857.

Built from https://develop.svn.wordpress.org/trunk@29299


git-svn-id: http://core.svn.wordpress.org/trunk@29081 1a063a9b-81f0-0310-95a4-ce76da25c4cd