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Integrates LiteRT-LM (Google) with Gemma 4 E2B-it for on-device spell/grammar correction in HeliBoard. After sentence-ending punctuation, the model checks the sentence and shows a correction in the suggestion strip. Tapping it replaces the original text — fully offline, no cloud API. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>