Extend the messaging Attachment type with optional storage fields so an adapter's
upload() can return a sendable reference (the socket needs contentRef/mimeType/
sizeBytes to persist the message part) while keeping the display url. Enables
messenger attachments end-to-end in host adapters.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
- Mail reader: .miu-mail-msg gets flex:0 0 auto so cards keep their natural height
in the scrolling column instead of being compressed + clipped by overflow:hidden.
- Reaction/emoji picker renders through a PopoverPortal to <body> (positioned +
themed) so it floats above the message list instead of being cut by the scroll
container's overflow. 72 tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
maaz519