Fix #7708: detailed viewableInBrowserObjects support and semantic-ui-…

[antcybersec]

Fixes #7708

I've addressed the issue where viewableInBrowserObjects wasn't working for links inside Slate text blocks. It turns out the link renderer was bypassing the configuration check completely. I updated the ViewLink component in volto-slate to correctly check if the user is anonymous and if the configuration allows files to be viewed in the browser. If so, it now sets the URL to @@display-file, so it opens properly instead of forcing a download.

While I was at it, I also fixed a build error I hit on Windows with pnpm. The webpack LESS configuration wasn't finding semantic-ui-less because it was looking for hardcoded paths that didn't match the pnpm symlinks on Windows. I updated it to use require.resolve and better regexes so the build works reliably across different setups.

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Closes #7708

[boring-cyborg]

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