The bookshelf right-click menu built itself with un-awaited
`Menu.append()` calls. Each append is an async IPC round-trip to the
Tauri backend, so the concurrent fire-and-forget requests resolved in
non-deterministic order on the Rust side and the native menu items
landed shuffled on every open (only reproducible on the native app,
invisible in jsdom).
Build the items in order and create the menu in a single
`await Menu.new({ items })` call for both the book and group handlers.
Order and conditional inclusion are unchanged.
Extract the order/inclusion logic into a pure `getBookContextMenuItemIds`
helper in `libraryUtils.ts` so the deterministic ordering is unit-tested
without mounting the component or mocking Tauri.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
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