PASS: name/avatar cards and pointer bodies remain visible at all four corners at 1080p and 1440p, with exact pointer tips.
PASS: normalized 1080p / 1440p coordinate mapping and bounds.
PASS: screenshot title/taskbar/side margins, selected video corners, outside-area rejection, saved selections and 1080p/1440p scaling.
PASS: 3440x1440 and 4330x1440 presentations fit 16:9 viewers with letterbox exclusion and exact edge mapping.
PASS: two-client rooms, private presenter role, invalid invitations, pointer routing, pause and clear.
PASS: stroke assembly, undo and pause rendering state.
PASS: 16-person room rosters with large avatars fit the bounded receive buffer.
PASS: native Windows clients create/join, receive 3440x1440 presenter dimensions, route pointers, pause and clear.
