Add PDF button and single-row public trial listing layout parity

[asku1990]

The old app had a PDF action and a compact single-row public listing presentation that the current v2 public trials pages do not fully match.

Please inspect the old v1 implementation before changing anything:

• ../beagleAppV1/kokeetall.php
• ../beagleAppV1/hallinta/ad_kokeetall.php
• any linked PDF/detail flow used from that page

What to verify in v1:

• The listing supports a PDF button/action for the trial row.
• The public listing can present all key fields in one row, matching the old app’s denser layout rather than the current split/basic presentation.
• Identify whether the PDF action opens a dedicated page or directly links to a PDF view, and mirror the same user flow in v2.

Implementation goal:

• Add the PDF button to the public trial listing.
• Adjust the public listing layout so the full row content is visible in the same compact way the old app used.
• Keep the change scoped to the public listing and its linked PDF flow unless the old source requires broader shared changes.

Suggested acceptance criteria:

• Each public trial row has a working PDF action.
• The list can render the row content in the same compact one-line style as the old app.
• Desktop and mobile behavior remain usable.
• Add/update tests for the button and layout behavior.