More space in Files grid view

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Feature description

As it stands, depending on screen aspect ratio, about as much items can be displayed using the grid view as the list view. This negates one of the potential benefits of the view, which is that more items can be visible on the screen at once. Even in the current, fairly large state, items also do not handle ellipsization of names well.

I'm proposing:

1. Decreasing the size of thumbnails by ~20%.
2. Decreasing padding inside items by ~50%.
3. Making file names wrap for 2-3 lines to allow for longer names if possible.
4. Making names ellipsize at the middle instead of the end. This would help make the common case of names that only differ at the end (eg. "Photo 1", "Photo 2") be distinct even when they ellipsize.

Any of these would be nice on their own as well :)

No file, test, or entry point is named. Start by locating the Files grid-view implementation and comparing its thumbnail, item padding, and filename rendering with list view. Done means the grid shows more items, supports longer names, and distinguishes names that differ near the end without harming readability.