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Select a vowel and one click places a combining acute accent over it; clicking again removes it (toggle). Inserts the literal Unicode char U+0301 right after the letter — plain text, not a custom TipTap mark — so it survives HTML/Markdown export, full-text search and public share with zero server/converter changes. Insert/remove is a single transaction (one Ctrl+Z), inherits the letter's marks (bold/italic/color), and restores the original selection so the active state toggles correctly. Editable bubble menu only. New pure helper stress-accent.ts (+ 5 unit tests). i18n: en 'Stress' / ru 'Ударение'. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>