Disable spell check

[rozsazoltan]

Add a setting that allows users to disable spell checking in text inputs/editors.

Currently, spell check is enabled by default, which can be distracting or unnecessary in some cases, especially when users write code, identifiers, technical terms, or multilingual content.

The new option should allow spell check to be turned off globally or for the relevant editor/input fields.

Acceptance criteria

• Users can disable spell check through a setting or configuration option.
• When disabled, affected text inputs/editors should use spellcheck="false".
• Existing behavior remains unchanged by default.

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