TranscriptionEditView: fix 4 failing tests:
- textarea → [role="textbox"] selector (editor is contenteditable, not <textarea>)
- button clicks → dispatchEvent(MouseEvent) for reliable Svelte 5 onclick with TipTap
- mentionedPersons test: init block with @mention token so deserialize() creates a
mention node; use userEvent.type + vi.waitFor (real timers) instead of fill +
fake timers, which prevents TipTap onUpdate from firing the debounce timer
EntityNavSection: anchor link click → add capture-phase preventDefault before
clicking to stop iframe navigation while allowing Svelte onclick handler to run
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
