Verifies highlightBlockId applies and removes the flash-highlight CSS class correctly. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Renders transcription blocks as readable text with [unleserlich]/[...] markers styled as italic muted text. Supports click-to-sync and flash highlight for scroll-sync feedback. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>