improving the UI side of ptz... and improving the way turns works with UI....

webui/src/ptz/usePtzSession.js

@@ -0,0 +1,36 @@
+import { useCallback, useEffect, useState } from 'react';
+import { useSessionActions, useSessionSelector } from '../context/SessionContext.jsx';
+
+export default function usePtzSession() {
+  const connected = useSessionSelector((state) => state.connected);
+  const socketId = useSessionSelector((state) => state.session?.socketId);
+  const canEnter = useSessionSelector((state) => Boolean(state.session?.ptzCamera?.permissions?.canEnter));
+  const { setOperatingMode, ptzRequestTurn } = useSessionActions();
+  const [entryError, setEntryError] = useState(null);
+  const enter = useCallback(async () => {
+    await setOperatingMode('ptz');
+    await ptzRequestTurn();
+  }, [setOperatingMode, ptzRequestTurn]);
+
+  useEffect(() => {
+    if (!connected || !socketId || !canEnter) return;
+    let active = true;
+    // Entry happens on route mount/reconnect, not on queue changes. Releasing a
+    // turn therefore leaves the page idle instead of silently requesting again.
+    // Both server actions are serialized and idempotent under Strict Mode.
+    (async () => {
+      await setOperatingMode('ptz');
+      if (active) await ptzRequestTurn();
+    })().then(() => {
+      if (active) setEntryError(null);
+    }).catch((err) => {
+      if (active) setEntryError(err.message);
+    });
+    return () => { active = false; };
+  }, [connected, socketId, canEnter, setOperatingMode, ptzRequestTurn]);
+
+  const retryEntry = useCallback(() => {
+    enter().then(() => setEntryError(null)).catch((err) => setEntryError(err.message));
+  }, [enter]);
+  return { entryError, retryEntry };
+}