Key findings:
- Jump to Date (task #7): DELETED — JumpToTime.tsx fully implemented upstream,
wired in RoomViewHeader.tsx:215
- useUnverifiedDeviceCount() hook EXISTS (useDeviceVerificationStatus.ts:65) —
task #65 is trivial
- useCallMembersChange() hook (useCall.ts:37-52) handles join/leave sounds
via MatrixRTCSessionEvent.MembershipsChanged — correct approach for #89
- MessageQuickReactions already in hover toolbar (Message.tsx:146-184) — #92
simpler than expected
- knockSupported() utility exists (matrix.ts:376) — #58 only needs RoomIntro button
- StateEventEditor in DevTools can already edit m.room.server_acl — #69 is a UX wrapper
- getMatrixToRoom() in matrix-to.ts already generates invite URLs — #24 just needs QR
- Glassmorphism: sidebar container safe for backdrop-filter (translateX only on items)
- Animated backgrounds: must use ::before pseudo-element, not backgroundImage
- matrix-js-sdk has no arbitrary profile field setters — #62 needs raw HTTP
- Toast system: build from scratch, insert at App.tsx:65 after OverlayContainerProvider
- JetBrains Mono already loaded via Google Fonts CDN in index.html:33
- MSC4151 report room endpoint confirmed live (405 on GET = POST-only endpoint exists)
- /.well-known/matrix/support not configured — needs server file creation + client reads
Full file reference table added with 30+ key file paths for all planned features.
Corrected 5 previously wrong architecture assumptions.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Server findings:
- Synapse 1.153.0 is FULLY UP TO DATE (latest as of 2026-05-19)
- MSC4140 (scheduled msgs), MSC3771 (thread receipts), MSC4133 (extended profiles)
all CONFIRMED supported via unstable_features flags
- MSC3892 (reaction redaction), MSC3266 (room summary) BLOCKED — not supported
- MSC4306 (thread subscriptions) BLOCKED — not supported
Upstream Cinny confirms (removed from build queue):
- Back to Latest button (RoomTimeline.tsx:2180), Mark rooms as read (Home.tsx:73),
Tombstone/upgrade banner (RoomTombstone.tsx), Speaking indicator (useCallSpeakers.ts),
Spoiler rendering (ImageContent/VideoContent — blur+click-reveal), Report message
Architecture facts documented:
- AvatarImage child constraint (no children — wrap externally)
- Sidebar translateX blocks backdrop-filter
- EC bridge: no participant events (use m.call.member state events instead)
- No in-app toast system (must build from scratch)
- Voice player at AudioContent.tsx:44, notification sounds hardcoded in ClientNonUIFeatures
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
jared