fix: 让显影参数覆盖完整范围

src/mosaic.test.ts

@@ -36,6 +36,14 @@ describe('selectKeywords', () => {
 
     expect(candidates.some((candidate) => candidate.selected)).toBe(true)
   })
+
+  it('显影 0% 不保留词语，100% 保留全部候选词', () => {
+    const hidden = selectKeywords(SOURCE, 0, 1)
+    const revealed = selectKeywords(SOURCE, 100, 1)
+
+    expect(hidden.some((candidate) => candidate.selected)).toBe(false)
+    expect(revealed.every((candidate) => candidate.selected)).toBe(true)
+  })
 })
 
 describe('generateMosaic', () => {