Function set_webcam_bubble_visibility 

pub fn set_webcam_bubble_visibility(
    visible: bool,
    app: AppHandle,
    state: State<'_, BubbleState>,
)

Explicit setter for the webcam bubble visibility. ISS-05 — the recorder’s camera_enabled RwSignal defaults to true while BubbleVisibility::default() is Hidden, so the always-flip toggle_webcam_bubble path was one click out of phase from every page mount. The setter aligns the bubble to the caller’s source of truth instead, and no-ops when already in the requested state — safe to spam from a reactive subscription.