View CV button downloads file instead of previewing it

[chamals3n4]

Description

On the candidate detail page, clicking "View CV" should open the candidate's CV in a
preview (new tab / inline viewer), but instead it triggers a file download.

Steps to Reproduce

1. Go to a candidate's profile (e.g. /candidates/:id)
2. Click the View CV button (top right, next to Hired/Close/Edit)
3. Observe the browser downloads the file instead of showing a preview

Expected Behavior

Clicking "View CV" should open the CV (PDF/image) in a new tab or an in-app preview modal,
letting the user view it without downloading.

Actual Behavior

The browser triggers a file download dialog/action instead of previewing the document.

Screenshots