Tiling suggestions upon tiling a window

### Problem

When I tile a window to one side, I almost always want to tile another window to the opposite side. Currently this looks like:

1. Tile the first window (e.g. with keyboard shortcuts or the window handle context menu)
2. Alt+Tab or search on the dock until I find and focus the other window, because it's partially obscured by the now-tiled window
3. Tile the second window (e.g. with keyboard shortcuts or the window handle context menu)

Since I almost always tile two things side-by-side, it seems like this could be streamlined a bit.

### Proposal

A nifty feature on Windows 10/11 is tiling "suggestions" when you tile one window: a miniature window spread of the remaining open windows on your workspace appears over your wallpaper in the non-tiled half of your display. This makes switching from floating windows to tiled really fast:

1. Tile the first window
2. Select the second window

I believe hitting escape or clicking in a non-window-preview area just cancels the suggestion. We would also need to determine how this works with the keyboard; I imagine the focus would default to the window spread and allow arrow keys to select a window.

### Prior Art (Optional)

Windows 10/11 :)