chrome-extension ai-rewriter text-rewriting gemini-ai google-ai writing-assistant text-editor browser-extension ai-writing text-improvement grammar-checker content-creation productivity-tool javascript ai-tools writing-enhancement text-processor chrome-addon ai-assistant text-transformation professional-writing content-editing language-processing nlp machine-learning artificial-intelligence web-extension productivity writing-tools content-optimization text-analysis natural-language-processing chrome-web-store browser-addon ai-powered text-enhancement writing-aid content-tools text-utilities ai-integration