Add PBN export queue button to publication importer (#317)

[mpasternak]

Summary

• Adds "Utwórz i dodaj do kolejki eksportu PBN" button to the publication importer review step
• Button appears conditionally when PBN integration is enabled (Uczelnia.pbn_integracja + pbn_aktualizuj_na_biezaco)
• On click, creates the publication and queues it for PBN export via sprobuj_utworzyc_zlecenie_eksportu_do_PBN_gui
• Adds Django messages display to the done step for HTMX partial responses (Foundation callout styling)

Files changed

• src/importer_publikacji/views.py — backend logic for PBN button handling and context flag
• src/importer_publikacji/templates/.../step_review.html — new button in review form
• src/importer_publikacji/templates/.../step_done.html — messages display for HTMX partials

Test plan

• Enable PBN integration in Uczelnia settings (both pbn_integracja and pbn_aktualizuj_na_biezaco)
• Import a publication via the importer — verify the new button appears next to "Utwórz publikację"
• Click "Utwórz i dodaj do kolejki eksportu PBN" — verify publication is created and success/error message appears
• Disable PBN integration — verify the button does not appear

🤖 Generated with Claude Code

[mpasternak]

@claude rebase

[claude]

Claude finished @mpasternak's task in 22s —— View job

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I'm unable to perform a rebase operation. Rebasing requires a force-push to the remote branch, which is a destructive operation outside my permitted scope.

To rebase this branch onto dev, you can run locally:

git fetch origin
git checkout fix/fd-317-przycisk-pbn-w-importerze
git rebase origin/dev
git push --force-with-lease origin fix/fd-317-przycisk-pbn-w-importerze

You can find more information and potential workarounds in the FAQ.