Release 4.217.0

The composer gets what the agents portal's own box had: a camera, Try again, and pictures made smaller before they go.

• A camera in the box (camera, in the post and agent presets; any site can name it): a sheet over the page, the whole screen on a phone, with the picture, Photo or Video, the shutter, Switch camera and Close, as a phone's camera app has. A photo or a clip (up to a minute) goes into the box as a file, nothing kept or sent before the message is. It opens through the shared capture core (ov-capture.js, loaded from beside the composer the first time), so its help when a camera does not open is the same plain help Live's go-live page gives; the tool is not drawn where the browser has no camera.
• Try again on a failed upload: the file's own picture (or icon) becomes the button, and a post's picture tile says "Try again" across it.
• Pictures made smaller before they upload: resize (the long side in pixels; data-ovc-resize on a box made by hand): 2560 for a post, a chat or a reply, 1568 for an agent (the size a model reads, as the agents portal sent them). JPEG, PNG and WebP only; a smaller file is never swapped for a bigger one; GIFs and SVGs are left as they are.
• Fixed: in the one-line chat box, the "Editing your message" and "Replying to …" bar is a line of its own above the words (4.216.0 drew it in the box's first column, over the words).