[Feature] Show day dividers in search results

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request.

• Yes

The feature

In the main timeline view, photos have day dividers, allowing us to quickly check which photos belong to a given day as we scroll. However, the same doesn't happen in search results, where this is sometimes very useful.

Google Photos seems to show day headers in both cases. Did we omit them in Immich on purpose, or was this an unintentional gap? If it's the latter, I'm happy to try out fixing it.

Platform

• Server
• Web
• Mobile