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Info.plistでTISIconIsTemplateを設定し、透過部分を含む黒一色のアイコンを用意することでOS設定で外観をダークモード・ライトモードそれぞれでよしなに選んでくれるようなのでアイコンをいじってみます。
標準日本語IMEのように16x16のアイコンでもいいんですが22x16 (44x32) のアイコンまで対応しているようなので二文字横に並べてみます。
新たにテキストフィールドにフォーカスしたときにホバーする現在のモードを表示するアイコンはひとまず前の正方形のときと同じ背景色のままでワイドアイコンにしています。