IQSS / dataverse-frontend / 25378174206

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Replace access-API zip endpoint with client-side streaming zip (M4)

Adds a browser-side streaming-zip download for the React file tree:

- `useStreamingZipDownload` engine drives `client-zip` from an async
  generator. Three strategies (pause-on-fail, skip-with-manifest,
  twopass-retry) are wired through a single decision-promise so the
  UI can resolve retry/skip/cancel choices without restarting the run.
- `FilesTreeDownloadTray` is a fixed bottom-sheet that shows progress,
  the file currently being added, and surfaces the pause/two-pass
  decisions inline. Stays out of the way while the user keeps browsing.
- `FilesTree` now bypasses the access-API signed-zip flow. Single-file
  downloads still anchor-click `file.downloadUrl`; multi-file downloads
  go through the streaming engine and pop the tray. The toolbar button
  is disabled while a zip is in flight to prevent double-runs.
- `useFileTreeDownload` now hands `FileTreeFile[]` to the host instead
  of bare ids, so the streaming engine has size/name/url for free.
- New locale strings under `tree.download.tray.*`. `client-zip` is the
  only new dep (~3 KB gzip).
- Cypress component spec covers the happy path, pause-on-fail-then-retry,
  and skip-with-manifest flow against a stubbed `fetch`.

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