Albums: bug fixes and improvements

[rohan-pandeyy]

A few things in Albums need fixing. Listing them here so they can be picked up together or
one at a time.

Bugs

1. The app freezes after you delete an album. Nothing is clickable until you reload.
2. A failed delete still removes the album from the list.
3. The confirmation box stays open behind the error popup when a delete fails.
4. The album list does not refresh after you delete an album or change its photos, so counts
   and covers go stale.
5. A grey overlay blocks the whole window while albums load, and again when you hit Refresh.
6. That overlay can get stuck for good if you leave an album while its photos are loading.
7. Album created and updated dates are filled in with the current time. The table has no such
   columns, so the dates are meaningless.
8. Locked albums show a photo from inside them as their cover.

Improvements

1. Pick the album cover automatically. Right now you right click a photo and choose "Set as
   Cover", which most people will never find. The first photo in the album is good enough.
2. Show placeholder tiles while loading instead of the grey overlay, like Memories does.
3. Match the album grid to the Memories grid so the two pages look consistent.

Also worth a look

• Opening one album downloads the whole photo library and then filters it down.
• Removing photos from an album has no confirmation, though deleting an album does.
• Locked albums still show how many photos they contain.