Restore PDF previews on Electron 41 by avoiding iframe-based embedding

[Copilot]

PDF previews in frontend/app/view/preview/ stopped rendering after the Electron 41 upgrade and failed inside Electron’s sandboxed PDF path. This change moves PDF preview rendering off the iframe codepath that regressed while preserving the existing streamed file URL behavior.

• Preview rendering

  • Replace the PDF preview <iframe> with native <object> / <embed> embedding in preview-streaming.tsx.
  • Keep the existing /wave/stream-file?... URL generation unchanged, so the backend/file streaming behavior stays the same.

• Targeted coverage

  • Add a focused renderer test for StreamingPreview that verifies:
    • PDFs render through object/embed
    • the old iframe path is no longer used
    • the streamed PDF URL is still constructed correctly

• Relevant shape of the change

  if (fileInfo.mimetype === "application/pdf") {
      return (
          <div className="flex flex-row h-full overflow-hidden items-center justify-center p-[5px]">
              <object data={streamingUrl} type="application/pdf" width="100%" height="100%">
                  <embed src={streamingUrl} type="application/pdf" width="100%" height="100%" />
              </object>
          </div>
      );
  }

• • Not included: the available screenshot did not clearly show a successful rendered PDF preview.

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