feat: multi-material overlays, presentation guides, and release prebuilds

Align control/presentation with presentation screen rect and darkness z-order; sync window titles and session window cleanup. Pack Win/Mac/Linux with npmRebuild disabled and release-native-prep for classic-level and sharp.

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

app/renderer/shared/ui/EllipsisText.tsx

@@ -0,0 +1,33 @@
+import React, { useCallback, useRef, useState } from 'react';
+
+type Props = {
+  text: string;
+  className?: string;
+};
+
+/** Однострочный текст с ellipsis; полный title при обрезке. */
+export function EllipsisText({ text, className }: Props) {
+  const ref = useRef<HTMLDivElement | null>(null);
+  const [title, setTitle] = useState<string | undefined>(undefined);
+
+  const syncTitle = useCallback(() => {
+    const el = ref.current;
+    if (!el) {
+      setTitle(undefined);
+      return;
+    }
+    setTitle(el.scrollWidth > el.clientWidth + 1 ? text : undefined);
+  }, [text]);
+
+  return (
+    <div
+      ref={ref}
+      className={className}
+      title={title}
+      onMouseEnter={syncTitle}
+      onMouseLeave={() => setTitle(undefined)}
+    >
+      {text}
+    </div>
+  );
+}