BC-7583 - fix bugs in socket implementation

[hoeppner-dataport]

Short Description

Fixing two bugs that were introduced with the implementation of websocket-communication for boards:

Problem 1: When a new card gets created by clicking on the corresponding button, it gets created without an empty text field element.

Problem 2: When the user hits enter key while being in a card title, a new text field element should be created at the beginning of the card and the cursor should jump into it.

Links to Ticket and related Pull-Requests

BC-7583 https://github.com/hpi-schul-cloud/schulcloud-server/pull/5086

Checklist before merging

• [x] QA: In addition to review, the code has been manually tested (if manual testing is possible)
• [x] PO: Any deviation from requirements was agreed with Product-Owner / ticket author / support-team
• [x] DEV: Every new component is implemented having accessibility in mind (e.g. aria-label, role property)

Notice: Please keep this Pull-Request as a Draft (or add WIP label), until it is ready to be reviewed

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud