DEMOS-2219 Remove Current column, enable View/Download on State & CMS Files

[nunesmlucas]

• Removed the Current flip-switch column (and its CurrentToggle component / react-switch import) from the State Files tab.
• Added a View column to the State Files tab, reusing the existing CMS Files "View" button (extracted into a shared viewColumn in fileColumns.tsx).
• View opens /document/:id in a new tab → PDFs preview inline, other formats download (existing DocumentPreview flow).

Story AC lists image files as a preview format, but DocumentPreview currently only previews application/pdf (images download). Out of scope here

[demos-git-service-account]

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