Some small issues with search

- [ ] When you open a folder and then directly search, the background refresh will kick you out of the search
- [ ] The header text is not alinged correctly. Should be left-aligned just like the heading (or with the content text in the list view)
- [ ] The search spinner should say a more contextual »Searching …« instead of »Loading«
- [ ] When removing the search or going back, you see »No files in here« first, which is confusing or alarming since it seems like the files are gone.