feat(recent-files): allow configuring image grouping

[cristianscheid]

• Resolves: #

Summary

Allow image grouping on recent files (configurable).

Done

• Added recent view sections to allow definition of image mime types to group by and also time window in minutes to group files uploaded close together
• Grouping images with mime types defined in the configuration already works
• Frontend prototype already implemented

TODO

• Adjust so image groups only occour on recent files tab
• Add margin to the left of child images from group
• Also allow grouping by certain time window (defined in the configuration)

Visuals

demo.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