Install: Remove reference to readme and add a hyphen missing since 2007.

props ocean90.
fixes #29290.

Built from https://develop.svn.wordpress.org/trunk@29611


git-svn-id: http://core.svn.wordpress.org/trunk@29385 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: Show upload errors above the grid rather than as a popup.

props pento, stephdau, helen. fixes #29141.

Built from https://develop.svn.wordpress.org/trunk@29612


git-svn-id: http://core.svn.wordpress.org/trunk@29386 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Modal: 

* the Image Details frame does not have a menu, indicate that by setting `menu: false` when adding states.
* mimic the default router rendering by toggling a `hide-menu` class on the frame when the region for menu is `null`
* remove the dead render code for the Image Details frame

See #29339.

Built from https://develop.svn.wordpress.org/trunk@29613


git-svn-id: http://core.svn.wordpress.org/trunk@29387 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media: Fix keying of selected attachments to color schemes.

props celloexpressions. see #28822.

Built from https://develop.svn.wordpress.org/trunk@29614


git-svn-id: http://core.svn.wordpress.org/trunk@29388 1a063a9b-81f0-0310-95a4-ce76da25c4cd
MCE View sandboxes:

* Use a `MutationObserver` to listen to the `body` class of the parent editor frame.
* In `wpview_media_sandbox_styles()`, only return the MEjs stylesheets.
* In `wp_ajax_parse_media_shortcode()` and `wp_ajax_parse_embed()`, return an object instead of an HTML blob to allow passing `body` and `head` separately	

Props avryl, azaozz.
Fixes #29048.

Built from https://develop.svn.wordpress.org/trunk@29615


git-svn-id: http://core.svn.wordpress.org/trunk@29389 1a063a9b-81f0-0310-95a4-ce76da25c4cd