A host wrapper like .view{position:relative;z-index:1} creates a stacking context
that traps the modal's fixed overlay below a sibling sticky header, no matter its
z-index. Render the modal through a ModalPortal (createPortal to document.body) so
it escapes the host stacking context + overflow entirely; the portal root copies
the SDK theme tokens from the live surface (synchronously, no unstyled paint) and
carries dark defaults as a fallback. Adds react-dom peer dep. 67 tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
InboxAdapter gains uploadAttachment + attachment params on mailReply/
composeInternal/composeExternal. MailReader reply and ComposeModal grow an
attach affordance (paperclip + pending chips); mail history renders sent
attachments. MockInboxAdapter implements upload. 67 tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Adds a third membership beyond dm/group: a discoverable, joinable room.
- contract: Membership += 'channel'; Conversation.topic; ChannelSummary +
CreateChannelInput; optional adapter methods browseChannels/createChannel/
joinChannel/leaveChannel (capability-degrading — absent hides the UI)
- MockAdapter implements them (seeds a joined public, a joinable public, and a
private channel); listConversations now returns only threads I'm in
- useChannels hook (browse/create/join/leave + supported flag)
- UI: sidebar sections (Channels vs Direct messages), a ＋ that opens a
ChannelBrowser (join + create), # / lock glyphs; themeable styles
- KernelClientAdapter passes channel membership + topic through
- 4 channel tests (mock browse/join/create + render browse→join); 52 total green
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
maaz519