New download interaction hard to discover

The UI on the left is non interactable. I spent a while wondering what was broken. The download interaction in the message action bar is nice, but I think you should be able to download files by just autopiloting to click on the large button/tile in the timeline too.

A simple pragmatic tweak for this would be to:

1. Make the button on the left clickable.
2. Ensure the cursor changes on hover to aid discoverability.
3. Stretch if not difficult: Tooltips.
   1. If the filename doesn’t fit on screen, show on immediate hover in one of our tooltips.
   2. Truncate filename (max chars 25-30ish?). Always show file extension.
   3. Show file size, stylising as e.g.: Filename.ext (20MB)

Given the entire component is visually stylised as a button, I have confidence in the interaction being discoverable enough for most users. However, we should be on alert to iterate if we get feedback otherwise.

If we learn users benefit from seeing file size in all cases, we should also iterate further on on the design.

[nadonomy]

@SimonBrandner edited before your comment, but thx!

[nadonomy]

@turt2live ah gotcha. Sorry, thought you were trying to describe an alternate hover interaction related to on-screen-ness!

Yep as a first cut (and for this release). My concern is if it ends up feeling redundant. Would also be happy to quickly screen share and rubber duck through how it feels in practise if that would be the most productive.