make UX consistent: changing card title in board view & card view

[alexanderdd]

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Is your feature request related to a problem? Please describe.

1. In board view, click into the title of a card, change it, click somewhere else -> title is auto saved
2. In modal view (single card view), click into the title, change it, click somewhere else -> title is NOT auto saved. You have to click the "->" button or hit enter. But when you hit enter in the board view, it adds a new line, which is then ignored when the title is saved.

Describe the solution you'd like

• edited titles are always autosaved, both in board view and in card view
• you can hit enter to save the title, both in board view and in card view (enter never leads to a new line in the title)
• the "->" button in the card view title can stay, clicking saves the title

Describe alternatives you've considered
none

Additional context

• IMO, it ist best UX if everything gets autosaved. If you accidentally remove an important title, you can always go to the card activity to find the old title.
• We need this consistency because of muscle memory. (You get used to hitting enter for saving, and then sometimes it does weird things..?)
  @nextcloud/designers