feat(tokens): app-local non-player tokens with session moves and UI polish

Add token library/placements, keep play-time moves for the session, lock presentation interactions, and fix export/import modal layout plus freeform trap label.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/shared/tokens/useSceneTokensSession.ts

@@ -0,0 +1,63 @@
+import { useEffect, useMemo, useRef, useState } from 'react';
+
+import { ipcChannels } from '../../../shared/ipc/contracts';
+import type { SceneTokensSessionEvent, SceneTokensSessionState } from '../../../shared/types';
+import { getDndApi } from '../dndApi';
+
+function applyEvent(
+  prev: SceneTokensSessionState | null,
+  event: SceneTokensSessionEvent,
+): SceneTokensSessionState {
+  const base = prev ?? { revision: 0, byPlacementId: {} };
+  if (event.kind === 'clear') {
+    return { revision: base.revision + 1, byPlacementId: {} };
+  }
+  const placementId = String(event.placementId ?? '');
+  return {
+    revision: base.revision + 1,
+    byPlacementId: {
+      ...base.byPlacementId,
+      [placementId]: { nx: event.nx, ny: event.ny },
+    },
+  };
+}
+
+export function useSceneTokensSession(): [
+  SceneTokensSessionState | null,
+  { dispatch: (event: SceneTokensSessionEvent) => Promise<void> },
+] {
+  const api = getDndApi();
+  const [state, setState] = useState<SceneTokensSessionState | null>(null);
+  const localRevisionRef = useRef(0);
+
+  useEffect(() => {
+    void api.invoke(ipcChannels.sceneTokensSession.getState, {}).then(({ state: s }) => {
+      localRevisionRef.current = Math.max(localRevisionRef.current, s.revision);
+      setState(s);
+    });
+    return api.on(ipcChannels.sceneTokensSession.stateChanged, ({ state: s }) => {
+      // Не затираем более свежий optimistic-стейт устаревшим broadcast
+      // (например, emit при смене сцены, пока последний move ещё в полёте).
+      if (localRevisionRef.current > s.revision) return;
+      localRevisionRef.current = s.revision;
+      setState(s);
+    });
+  }, [api]);
+
+  const apiWrap = useMemo(
+    () => ({
+      dispatch: async (event: SceneTokensSessionEvent) => {
+        setState((prev) => {
+          const next = applyEvent(prev, event);
+          localRevisionRef.current = Math.max(localRevisionRef.current, next.revision);
+          return next;
+        });
+        const res = await api.invoke(ipcChannels.sceneTokensSession.dispatch, { event });
+        void res;
+      },
+    }),
+    [api],
+  );
+
+  return [state, apiWrap];
+}