The browser surface

the picker moves this surface to another tab of the same profile; a tab is created by the session whose calls drive it and closes with that session, never from here. take control makes this surface the one viewer whose clicks, keys, wheel and history arrows reach the page; a watcher's arrows are drawn disabled, and the server refuses a move from anyone but the holder. The server pushes who holds the role, so another surface says take control rather than guessing. The gestures land as trusted input, and the person's own cursor is drawn by the page, not by the client. The two arrows are the page's own history: back was enabled by the link that reached this page, forward has nowhere to go yet, and Cmd+[ and Cmd+] are their keys. The ask's own words sit under the bar because the hand-off's card is drawn in the chat behind this page; a page moved to another tab keeps the ask's name in the bar and offers none of its answers, and a page raised for another seat is lowered when that seat is left, so it never covers the seat whose ask is waiting.

the phone's shell has no native overlay, so each relayed frame is a WebP still the page draws on a canvas. The picture keeps its own shape - a wide page in a portrait phone is letterboxed, and taking control lays it out at the phone's shape. The bar over it is the same bar, and a hand-off's row is wider than the phone in portrait: its actions wrap to a line of their own, so Done, send feedback once the note has words and Not now stay on screen and under the finger at the narrowest width. take control makes the phone the one viewer whose taps, keys and swipes reach the page, the bar clears the status band with its own safe-area padding, and the newest frame is kept for a canvas that mounts after it arrived.

a plain browser tab has no shell, so the page draws the whole takeover itself: a fixed overlay over the viewport, the bar at its top and a canvas under it. Attaching, listing the tabs, lowering, taking control, moving through history and laying the page out are the socket's own messages rather than the shell's invokes, and there is no rect to report - the overlay's own box is the surface. Back to chat lowers it and leaves the hand-off parked, and the chat is still under it, so the tab never leaves the app.

the note rides whichever answer is picked: Done approves, send feedback asks for a revision and Not now defers the ask. For feedback the words go as a prompt and the session addresses them before handing the page off again. The mic is the composer's own, so a take here is the same capture the dock draws. Back to chat closes the takeover and leaves the hand-off parked, the session still waiting.

a take replaces the field with the dock's own card, and the card takes the line: it grows to everything the mic leaves and its graph takes that room, so what the take is doing is the row's meter rather than a pill in an otherwise empty row. The mic is the press that ends the take, and the card's ✕ abandons it without sending.

the card draws from this page's own take, which exists only once the capture has opened; until then the row keeps its field and mic, and nothing says the take is running, so a slow open reads as a dead press. The line is drawn only once the open outlasts a quick one - a fast press is not a state to flash - and it goes when the card arrives.

the socket was gone before the frame crossed, so the bar names the loss in its own line and the field keeps the words: the hand-off is not answered, and an answer can be pressed again when the connection is back. An answer that does leave clears no line here and ends the park.

once the takeover is up the card leaves the actions to the bar.

the strip's row opens the same takeover outside a hand-off; its panel lists the profile's tabs with each one's owner and state, and show raises that tab. Hide returns to the chat and the sessions keep driving the tabs. The row only exists while the profile has a tab: with none, the segment draws nothing at all rather than an empty "0 tabs" row.

a failure draws the shell's own sentence - the port, the profile, the framework, or a page area that could not be placed - and the hand-off stays parked until Done, Not now or send feedback once the note has words; try again asks the shell for the surface once more. The tab picker is drawn only when the last list it read or was pushed still has tabs.