feat(broadcast): guard against accidentally killing the live display

src/components/broadcast/broadcast-outputs-dialog.tsx

@@ -126,8 +126,22 @@ export function BroadcastOutputsDialog({
     }
   }
 
-  const handleToggle = (output: BroadcastOutput, enabled: boolean) =>
+  const handleToggle = (output: BroadcastOutput, enabled: boolean) => {
+    // Turning off an output while live kills what the congregation sees —
+    // make the operator confirm instead of doing it on one click.
+    if (!enabled && useBroadcastStore.getState().isLive) {
+      toast.warning("This is your live broadcast display", {
+        description:
+          "Closing it will stop what the congregation sees right now.",
+        action: {
+          label: "Close anyway",
+          onClick: () => void withBusy(output.id, () => disableOutput(output)),
+        },
+      })
+      return
+    }
     void withBusy(output.id, () => (enabled ? enableOutput(output) : disableOutput(output)))
+  }
 
   const handleRemove = (output: BroadcastOutput) =>
     void withBusy(output.id, async () => {

src/components/panels/live-output-panel.tsx

@@ -1,4 +1,6 @@
 import { useEffect } from "react"
+import { toast } from "sonner"
+import { getAllWindows } from "@tauri-apps/api/window"
 import { PanelHeader } from "@/components/ui/panel-header"
 import { CanvasVerse } from "@/components/ui/canvas-verse"
 import { Switch } from "@/components/ui/switch"
@@ -7,6 +9,12 @@ import { useBroadcastStore, useBibleStore } from "@/stores"
 import { presentVerse, toVerseRenderData } from "@/hooks/use-broadcast"
 import { bibleActions } from "@/hooks/use-bible"
 
+async function hasOpenBroadcastWindow(): Promise<boolean> {
+  const windows = await getAllWindows()
+  // Output windows are labeled `broadcast-${outputId}` (see outputWindowLabel).
+  return windows.some((w) => w.label.startsWith("broadcast-"))
+}
+
 export function LiveOutputPanel() {
   const isLive = useBroadcastStore((s) => s.isLive)
   const autoLive = useBroadcastStore((s) => s.autoLive)
@@ -50,6 +58,16 @@ export function LiveOutputPanel() {
       const selected = useBibleStore.getState().selectedVerse
       if (selected) void presentVerse(selected)
     }
+    if (checked) {
+      void hasOpenBroadcastWindow().then((open) => {
+        if (!open) {
+          toast.warning("No broadcast window open", {
+            description:
+              "Go live won't be visible to the congregation until you open a broadcast window in Broadcast Settings.",
+          })
+        }
+      })
+    }
   }
 
   return (