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With a fork that reports `screensharePrompt` (element-call lotus-screenshare- prompt), the call bar and status bar keep their screenshare button on every engine. Where the click can't be delegated, starting asks the fork to show "Share your screen?" inside the call frame (io.lotus.prompt_screenshare) instead of our own confirm; its Share click starts the share. Stopping works from the bar as before (no click needed in the frame). Chromium is unchanged. - useScreenshareMode: hidden (older fork's corner button) | prompt | direct. - The room's call policy is also pushed to the fork in prompt mode, so the prompt never opens where sharing is forbidden. - Picture-in-picture: the "Return to call" overlay covers the frame; while the fork reports the prompt open it lets clicks through to it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA