fix(练习): 修复答案隐藏后焦点恢复逻辑

feat(知识领域): 添加敏捷裁剪因素数据

- 修复答案隐藏后聚焦到第一个空输入框而非第一个输入框
- 添加 restoreFocus 辅助函数统一处理焦点恢复
- 更新知识领域裁剪因素数据

via [HAPI](https://hapi.run)

Co-Authored-By: HAPI <noreply@hapi.run>

src/pages/ProcessPracticePage.tsx

@@ -90,6 +90,23 @@ export default function ProcessPracticePage() {
     }
   }, [answeredCells, currentCellId])
 
+  // 恢复焦点到第一个空输入框
+  const restoreFocus = useCallback(() => {
+    setTimeout(() => {
+      const inputs = document.querySelectorAll('.practice-input-area input')
+      const firstEmptyInput = Array.from(inputs).find(
+        (input) => !(input as HTMLInputElement).value
+      ) as HTMLInputElement
+
+      if (firstEmptyInput) {
+        firstEmptyInput.focus()
+      } else {
+        // 如果所有输入框都有值，聚焦到第一个
+        (inputs[0] as HTMLInputElement)?.focus()
+      }
+    }, 100)
+  }, [])
+
   // 切换到指定格子
   const switchToCell = useCallback(
     (cell: CellInfo) => {
@@ -251,16 +268,9 @@ export default function ProcessPracticePage() {
       setShowAnswerForCell(null)
       setInputLocked(false)
       announceToScreenReader('答案已隐藏')
-
-      // 恢复焦点到第一个输入框
-      setTimeout(() => {
-        const firstInput = document.querySelector(
-          '.practice-input-area input'
-        ) as HTMLInputElement
-        firstInput?.focus()
-      }, 100)
+      restoreFocus()
     }
-  }, [showAnswerForCell])
+  }, [showAnswerForCell, restoreFocus])
 
   // 自动过期检查
   useEffect(() => {
@@ -270,14 +280,7 @@ export default function ProcessPracticePage() {
     if (remainingTime <= 0) {
       setShowAnswerForCell(null)
       setInputLocked(false)
-
-      // 恢复焦点
-      setTimeout(() => {
-        const firstInput = document.querySelector(
-          '.practice-input-area input'
-        ) as HTMLInputElement
-        firstInput?.focus()
-      }, 100)
+      restoreFocus()
       return
     }
 
@@ -285,18 +288,11 @@ export default function ProcessPracticePage() {
       setShowAnswerForCell(null)
       setInputLocked(false)
       announceToScreenReader('答案已自动隐藏')
-
-      // 恢复焦点
-      setTimeout(() => {
-        const firstInput = document.querySelector(
-          '.practice-input-area input'
-        ) as HTMLInputElement
-        firstInput?.focus()
-      }, 100)
+      restoreFocus()
     }, remainingTime)
 
     return () => clearTimeout(timer)
-  }, [showAnswerForCell])
+  }, [showAnswerForCell, restoreFocus])
 
   // 点击格子切换（允许回顾已答对的格子）
   const handleCellClick = useCallback(