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Browsers already spellcheck a plain <textarea> by default (confirmed in-browser: spellcheck read true on the composer with nothing disabling it), but that's an implicit default rather than a guarantee across every browser/PWA context. Set spellCheck explicitly on both the composer and the message-edit textarea so it can't silently be off somewhere it wasn't verified. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>