Downloads require an Authorization header, which <iframe>/<img> cannot
send. The previous blob: workaround broke under download managers (IDM
hooks blob URLs, fails to resolve them, and leaves a 0-byte file) and in
Chrome's mobile emulation, which has no inline PDF plugin.
Backend:
- preview_token.py: HMAC-signed token bound to one (quote, kind, file)
with a 5-minute TTL, keyed off an existing secret
- GET /quotes/{id}/preview-url/{kind}/{attachment} mints the URL
- the two file GET routes accept a Bearer session OR the signed ?t= token
(they leave the global auth dep, so the other six file routes now carry
it explicitly — nothing is open by omission)
Frontend:
- api.files.previewUrl() replaces the blob helper
- shared FilePreviewModal + useFilePreview; FileList and the dashboard
quote card both use it
- PDFs render with the browser's native viewer on desktop and pdf.js on
canvas where no inline viewer exists (mobile); pdf.js is fed the bytes
in memory so no PDF URL is exposed for a download manager to intercept
- removed the per-attachment download buttons on the dashboard card and
the modal header
Ops:
- nginx: explicit MIME types (.mjs as text/javascript) — a module worker
served as octet-stream is refused and crashed the page
- frontend service bypasses the nginx entrypoint, whose apk manifest call
hangs when the package mirror is unreachable (502s)
