on loading Deck, show board list (don't collapse it)

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Describe the bug
on loading Deck, the upcoming cards view is shown with the board list sidebar collapsed. This confuses users, they don't know how to get to other boards, or that other boards even exist.

To Reproduce
Steps to reproduce the behavior:

1. Click on Deck in the top menu bar
2. see the upcoming cards view (board list view on the left is collapsed on loading)
3. be confused: where is the board that my co-worker told me to look at?

Expected behavior
On loading Deck, show upcoming cards view, but with the board list sidebar open.

Alternative: on loading, show the board list sidebar briefly, then slide it away. So the user is aware that it is there.

Comments

• The board list sidebar gives essential orientation to the user, shows him/her where he/she is, and what else exists.
• The collapsing of the sidebar should be a deliberate user action (clicking on the hamburger icon).
• I assume that the most frequent use of Deck is clicking on Deck in top menu, then going to a board. For this action, now you need three clicks, if my proposal is implemented it goes back to two clicks (was two clicks in the past).
• I can not think of an application that has a sidebar but collapses it by default -- it is always open in the beginning.
• I think this classifies as a UX bug (not a feature), that's why I entered it as a bug.

Client details:

• OS: Linux Mint
• Browser Firefox
• Version 83
• Device: desktop

Server
Nextcloud 19.0.4
Deck 1.2.1

Start by reproducing the issue from the Deck entry in the top menu and inspect how the upcoming cards view initializes the board-list sidebar. The work is done when the sidebar is open on load, or when the chosen brief-display alternative makes its presence clear before collapsing.