Add "ENTER" to submit and open new entry on shopping lists

[StarkZarn]

First Check

• I used the GitHub search to find a similar requests and didn't find it.
• Checked the tasks tagged issues and verified my feature is not covered

Please provide a concise description of the problem that would be addressed by this feature.

Currently shopping list interaction requires mouse movement to click the save button for each and every entry. A keyboard-only workflow as an option would be much smoother.

Please provide a concise description of the feature that would resolve your issue.

Quality of life - "enter"/"return" opens a new a line in the text field in shopping lists. In my opinion it should submit the current text and open a new line, so multiple entries can be added with only keyboard interaction.

Please consider and list out some caveats or tradeoffs made in your design decision

Users who may depend on CRLF within a single shopping list entry would have to adjust to a shift+click workflow. This seems unlikely to be a majority of people though.

Additionally, a good example of how this might work would be the lists feature in Planka, if anyone is unsure about what I'm getting at.

Additional Information

• If this is accepted I'm willing to submit a PR to provide this feature
• If this is accepted I'm willing to help maintain this feature
• I'm willing to sponsor/pay a developer to do this work

[legrego]

Related: #2683

[StarkZarn]

Cheers. Apologies for not finding this in my cursory search prior to opening.