fix(view): enable the import apply button after the sample names are filled

Setting the project name programmatically does not fire 'input', so the apply
button stayed disabled after 샘플 P1 사용 even with P1 checked. The button is
now refreshed after the names are filled.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

src/main.ts

@@ -1176,6 +1176,8 @@ const SAMPLE_PROJECT = { name: '운곡교P1', bridge: '운곡교' } as const;
 function fillSampleNames(): void {
   $<HTMLInputElement>('project-name').value = SAMPLE_PROJECT.name;
   $<HTMLInputElement>('bridge-name').value = SAMPLE_PROJECT.bridge;
+  // Setting .value does not fire 'input', so the apply button must be refreshed here.
+  updateApply();
 }
 
 $<HTMLButtonElement>('pick-sample').addEventListener('click', async () => {