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Replace direct innerHTML usage with replaceChildren/createElement/textContent to render error and loading UI. Adds fallbacks for missing tagName/message values and constructs DOM nodes programmatically (components/simple-transcription, interfaces/transcription, interfaces/custom, interfaces/manage-columns) to avoid accidental HTML injection and preserve existing DOM structure.
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This PR hardens TPEN-interfaces against potential XSS vectors in targeted error/loading UI paths by removing dynamic HTML interpolation and using safe text rendering instead.