[WIP] WIP address feedback on language tags in edit implementation

[Copilot]

• Add aria-hidden="true" attribute to the language code span in StyleEditor.pug
• Fix spelling: "psuedo-element" → "pseudo-element" in StyleEditor.ts
• Fix spelling: "psuedo-element" → "pseudo-element" in StyleEditor.less
• Validate changes with linting
• Reply to review comment

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