Take over over a bot's remote screen never sent the client's text
clipboard to noVNC: screen-pane.tsx built the RFB session but had no
paste handler and never called clipboardPasteFrom, so Cmd/Ctrl+V into
a remote input did nothing (#123089). The gateway already gates
ClientCutText as lease-checked input, so the missing leg was purely
client-side.
Add an explicit-gesture `paste` listener on the canvas, forwarded only
while this viewer's RFB client is not view-only (i.e. holds the
lease); no polling, no clipboard logging. Listener is torn down with
every detach so it never outlives its RFB client.
2d6657d72c