fix(练习): 修复输入法组合期间焦点跳转导致字母分散问题

- 组合输入期间禁止useEffect自动聚焦到下一个空输入框
- onCompositionEnd直接传入index和value,不再扫描数组查找
- 确保拼音字母留在同一输入框,确认后正确分散成中文

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

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

src/components/practice/InputArea.tsx

@@ -11,8 +11,8 @@ interface InputAreaProps {
   inputLocked: boolean
   lastErrorTimestamp: number | null
   onInputChange: (newInput: string[]) => void
-  onCompositionStart: () => void
-  onCompositionEnd: () => void
+  onCompositionStart: (index: number) => void
+  onCompositionEnd: (index: number, value: string) => void
   onPaste: (e: React.ClipboardEvent) => void
 }
 
@@ -31,11 +31,12 @@ export function InputArea({
 
   // 自动聚焦到第一个空输入框
   useEffect(() => {
+    if (isComposing || inputLocked) return
     const firstEmptyIndex = userInput.findIndex((char) => !char)
     if (firstEmptyIndex !== -1 && inputRefs.current[firstEmptyIndex]) {
       inputRefs.current[firstEmptyIndex]?.focus()
     }
-  }, [userInput])
+  }, [userInput, isComposing, inputLocked])
 
   const handleCharInput = (
     index: number,
@@ -137,8 +138,10 @@ export function InputArea({
                 value={char}
                 onChange={(e) => handleCharInput(index, e)}
                 onKeyDown={(e) => handleKeyDown(index, e)}
-                onCompositionStart={onCompositionStart}
-                onCompositionEnd={onCompositionEnd}
+                onCompositionStart={() => onCompositionStart(index)}
+                onCompositionEnd={(e) =>
+                  onCompositionEnd(index, e.currentTarget.value)
+                }
                 onPaste={onPaste}
                 disabled={inputLocked}
                 className={clsx(

src/pages/ProcessPracticePage.tsx

@@ -207,39 +207,41 @@ export default function ProcessPracticePage() {
   )
 
   // 输入法状态管理
-  const handleCompositionStart = useCallback(() => {
+  const handleCompositionStart = useCallback((_index: number) => {
     isComposingRef.current = true
     setIsComposing(true)
   }, [])
 
-  const handleCompositionEnd = useCallback(() => {
+  const handleCompositionEnd = useCallback(
+    (index: number, value: string) => {
       isComposingRef.current = false
       setIsComposing(false)
       // 输入法确认后,需要将当前输入框中的所有字符分散到后续输入框
       requestAnimationFrame(() => {
         const currentInput = latestInputRef.current
-      // 找到第一个有内容且长度>1的输入框(输入法组合的结果)
-      const composedIndex = currentInput.findIndex((char) => char.length > 1)
-
-      if (composedIndex !== -1) {
-        const composedText = currentInput[composedIndex]
-        const chars = composedText.split('')
+        const composedText = value
         const newInput = [...currentInput]
 
-        // 将组合的字符分散到后续输入框
-        for (let i = 0; i < chars.length && composedIndex + i < newInput.length; i++) {
-          newInput[composedIndex + i] = chars[i]
+        if (composedText) {
+          const chars = composedText.split('')
+          for (
+            let i = 0;
+            i < chars.length && index + i < newInput.length;
+            i++
+          ) {
+            newInput[index + i] = chars[i]
+          }
+        } else {
+          newInput[index] = ''
         }
 
         latestInputRef.current = newInput
         setUserInput(newInput)
         validateInput(newInput)
-      } else {
-        // 没有多字符组合,直接验证当前输入
-        validateInput(currentInput)
-      }
       })
-  }, [validateInput])
+    },
+    [validateInput]
+  )
 
   // 批量粘贴处理
   const handlePaste = useCallback(