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Follow-ups after merging PR #3128 (with the #2990 preview work): - PDF preview failed on every browser without Map.prototype.getOrInsertComputed (Chrome < 145, Firefox < 144, older Safari): "This file cannot be previewed" for any PDF. Load pdf.js's legacy build, which bundles the polyfills for page and worker, and bundle the worker through Vite (?worker&url) so build.target lowers its class static block for Safari 16.0-16.3. The browser-baseline check only scanned .js output and never saw the copied .mjs worker; it scans .mjs too. - PDF grid thumbnails only existed after someone opened the preview. Page one is now rendered server-side with PDFium (pypdfium2, new dependency, prebuilt wheels for every shipped platform) on upload, ZIP extraction and external-folder scans; Generate Thumbnails backfills PDFs as well. Renders are serialised behind a lock (PDFium is not thread-safe), run off the event loop, and scale from the page size so a huge MediaBox cannot allocate a huge bitmap. Unreadable PDFs land without a thumbnail and keep the browser fallback. - A large STEP file takes over a minute to mesh in the browser and showed only a spinner. STEP loads now show "Converting STEP model... N s" and a note that large files can take a minute or more, in all 15 locales. - Drop the two occt-import-js "externalized for browser compatibility" build warnings (path/crypto are only required in its Node branch); any other externalization still shows.