feat: 휴가 관리 컴팩트화 + 자동 저장 + 소숫점 표시 개선

- 레이아웃 컴팩트하게 변경 (패딩/마진 축소, 가로 배치)
- 저장 버튼 제거하고 NumberPicker 변경 시 자동 저장
- 소숫점 없을 때 정수로 표시 (22), 0.5일 때 소숫점 표시 (21.5)
- ScrollView 제거 (불필요한 스크롤 최소화)

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

app/src/main/java/com/example/shiftalarm/FragmentSettingsLab.kt

@@ -4,16 +4,18 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.Toast
+import android.widget.NumberPicker
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.lifecycleScope
 import com.example.shiftalarm.databinding.FragmentSettingsLabBinding
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.delay
 
 class FragmentSettingsLab : Fragment() {
 
     private var _binding: FragmentSettingsLabBinding? = null
     private val binding get() = _binding!!
+    private var isInitialLoad = true
 
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,
@@ -28,7 +30,6 @@ class FragmentSettingsLab : Fragment() {
         
         setupNumberPicker()
         loadAnnualLeave()
-        setupSaveButton()
     }
 
     private fun setupNumberPicker() {
@@ -36,42 +37,65 @@ class FragmentSettingsLab : Fragment() {
             minValue = 1
             maxValue = 25
             wrapSelectorWheel = false
+            
+            // 값 변경 시 자동 저장
+            setOnValueChangedListener { _, _, newVal ->
+                if (!isInitialLoad) {
+                    saveAnnualLeave(newVal)
+                }
+            }
         }
     }
 
     private fun loadAnnualLeave() {
         lifecycleScope.launch {
+            isInitialLoad = true
             val repo = ShiftRepository(requireContext())
             
             val annualLeave = repo.getAnnualLeave()
             annualLeave?.let {
                 binding.npTotalDays.value = it.totalDays.toInt()
-                binding.tvRemainingDays.text = String.format("%.1f", it.remainingDays)
+                binding.tvRemainingDays.text = formatRemainingDays(it.remainingDays)
             } ?: run {
                 // Default: 15 days
                 binding.npTotalDays.value = 15
-                binding.tvRemainingDays.text = "15.0"
+                binding.tvRemainingDays.text = "15"
+            }
+            
+            // 초기 로드 완료 후 플래그 변경
+            delay(100)
+            isInitialLoad = false
+        }
+    }
+
+    private fun saveAnnualLeave(totalDays: Int) {
+        lifecycleScope.launch {
+            val repo = ShiftRepository(requireContext())
+            
+            repo.recalculateAndSaveAnnualLeave(totalDays.toFloat())
+            
+            val updated = repo.getAnnualLeave()
+            updated?.let {
+                binding.tvRemainingDays.text = formatRemainingDays(it.remainingDays)
+                showCustomToast(requireContext(), "총 연차 ${totalDays}일로 설정되었습니다 (남은 연차: ${formatRemainingDays(it.remainingDays)}일)")
             }
         }
     }
 
- private fun setupSaveButton() {
- binding.btnSaveAnnualLeave.setOnClickListener {
- val totalDays = binding.npTotalDays.value.toFloat()
-
- lifecycleScope.launch {
- val repo = ShiftRepository(requireContext())
-
- repo.recalculateAndSaveAnnualLeave(totalDays)
-
- val updated = repo.getAnnualLeave()
- updated?.let {
- binding.tvRemainingDays.text = String.format("%.1f", it.remainingDays)
- showCustomToast(requireContext(), "연차가 저장되었습니다. (남은 연차: ${String.format("%.1f", it.remainingDays)}일)")
- }
- }
- }
- }
+    /**
+     * 남은 연차 표시 형식 개선
+     * - 정수면 정수로 표시 (예: 22)
+     * - 소숫점 있으면 소숫점 표시 (예: 21.5)
+     */
+    private fun formatRemainingDays(days: Float): String {
+        return if (days == days.toInt().toFloat()) {
+            // 정수인 경우
+            days.toInt().toString()
+        } else {
+            // 소숫점이 있는 경우 (0.5 등)
+            String.format("%.1f", days)
+        }
+    }
 
     override fun onDestroyView() {
         super.onDestroyView()