chore: add export/import and remove unused ones

src/features/DisplayFont/index.ts

@@ -1,5 +1 @@
-export { displayedFontsStore } from './model';
-export {
-    FontDisplay,
-    FontSampler,
-} from './ui';
+export { FontSampler } from './ui';

src/features/DisplayFont/ui/index.ts

@@ -1,7 +1,3 @@
-import FontDisplay from './FontDisplay/FontDisplay.svelte';
 import FontSampler from './FontSampler/FontSampler.svelte';
 
-export {
-    FontDisplay,
-    FontSampler,
-};
+export { FontSampler };