Fix Cmd/Ctrl + backspace behaviour in slate blocks #7815
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Fixes #7814
Previously, the deletion relied on native browser behaviour, which caused different results depending on the browser. This change performs the deletion via Slate APIs, ensuring predictable and browser-independent behaviour.
Currently, the deletion uses
unit: "word", which matches the common expectation. This can be adjusted if a different behaviour is preferred. (e.g., line-based deletion). This follows the same approach already used in existing Slate editor extensions (e.g.breakListInWidget) to ensure consistent editor behaviour.