fix(files): Exclude file size of excluded files in personal files view

[rgroothuijsen]

• Resolves: [Bug]: Reported total size under personal files seems to include team folder size #58423

Summary

The "Personal files" view filters group folders from the directory listing, but does not adjust the reported total size. This PR adjusts the file size after the folders have been filtered.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[susnux]

This file is missing the SPDX headers, please add them

[susnux]

Thank you for the pull request! Only one real block: The missing SPDX headers.

[susnux]

@rgroothuijsen can you please:

1. rebase onto current master (git fetch --all && git rebase upstream/master)
2. compile the assets (npm ci && npm run build)

[susnux]

Something went wrong during your rebase you committed too many unrelatd changes

[rgroothuijsen]

Apologies, I think I messed up my branch by previously amending commits, so I got a warning recommending that I merge instead of rebasing. I can try rebasing again to see if that helps.