Fix TypeScript v6 compatibility: remove CSS side-effect imports from .d.ts files

src/lib/components/CandidateBox.ts

@@ -1,5 +1,3 @@
-import "./css/CandidateBox.css";
-
 import Utilities from "../services/Utilities";
 import {
   CandidateBoxParams,

src/lib/components/Keyboard.ts

@@ -1,5 +1,3 @@
-import "./css/Keyboard.css";
-
 import { getDefaultLayout } from "../services/KeyboardLayout";
 import PhysicalKeyboard from "../services/PhysicalKeyboard";
 import Utilities from "../services/Utilities";