feat(recent-files): add recent_files_limit config on files settings

[cristianscheid]

• Resolves: #

Summary

• Adds recent_files_limit option to the Files settings menu, persisted in the oc_preferences table.

• Allows users to dynamically configure the maximum number of items displayed in the Recent tab of the Files app.

• The limit is passed as a parameter to getRecentSearchCustom() method from the library counterpart at nextcloud-libraries/nextcloud-files.

• Adds <nc:last_activity> DAV property (selectable and sortable)

  • <nc:last_activity> resolves to max(mtime, upload_time) for a given file/folder, ensuring recently uploaded files with an older mtime are correctly ranked in the Recent section

• This PR depends on this nextcloud-libraries/nextcloud-files PR being merged first to support the limit parameter: feat(recent-search): add parameter to allow dynamic limit of returned… nextcloud-libraries/nextcloud-files#1527

Visuals

Screencast.from.06-03-2026.18.53.02.webm

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

[cristianscheid]

/compile amend/