feat: 휴가 관리 NumberPicker → Spinner 변경 + 저장 버튼 복원

- NumberPicker 대신 Spinner(드롭다운) 사용
- 값 변경 시 자동 저장 제거하고 저장 버튼 복원
- 더 직관적인 UI 제공

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

@@ -4,18 +4,16 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.NumberPicker
+import android.widget.ArrayAdapter
 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?,
@@ -28,56 +26,51 @@ class FragmentSettingsLab : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         
-        setupNumberPicker()
+        setupSpinner()
         loadAnnualLeave()
+        setupSaveButton()
     }
 
-    private fun setupNumberPicker() {
-        binding.npTotalDays.apply {
-            minValue = 1
-            maxValue = 25
-            wrapSelectorWheel = false
-            
-            // 값 변경 시 자동 저장
-            setOnValueChangedListener { _, _, newVal ->
-                if (!isInitialLoad) {
-                    saveAnnualLeave(newVal)
-                }
-            }
-        }
+    private fun setupSpinner() {
+        // 1~25일 선택 가능한 어댑터 설정
+        val daysList = (1..25).map { "${it}일" }.toList()
+        val adapter = ArrayAdapter(requireContext(), android.R.layout.simple_spinner_item, daysList)
+        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
+        binding.spinnerTotalDays.adapter = adapter
     }
 
     private fun loadAnnualLeave() {
         lifecycleScope.launch {
-            isInitialLoad = true
             val repo = ShiftRepository(requireContext())
             
             val annualLeave = repo.getAnnualLeave()
             annualLeave?.let {
-                binding.npTotalDays.value = it.totalDays.toInt()
+                // 저장된 값이 있으면 해당 위치 선택 (0-indexed)
+                binding.spinnerTotalDays.setSelection(it.totalDays.toInt() - 1)
                 binding.tvRemainingDays.text = formatRemainingDays(it.remainingDays)
             } ?: run {
-                // Default: 15 days
-                binding.npTotalDays.value = 15
+                // Default: 15 days (index 14)
+                binding.spinnerTotalDays.setSelection(14)
                 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())
+    private fun setupSaveButton() {
+        binding.btnSaveAnnualLeave.setOnClickListener {
+            val selectedPosition = binding.spinnerTotalDays.selectedItemPosition
+            val totalDays = selectedPosition + 1 // 0-indexed to actual days
             
-            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)")
+            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 저장되었습니다 (남은 연차: ${formatRemainingDays(it.remainingDays)}일)")
+                }
             }
         }
     }

app/src/main/res/layout/fragment_settings_lab.xml

@@ -47,7 +47,10 @@
                 android:orientation="horizontal"
                 android:gravity="center_vertical">
 
-                <NumberPicker
+                <Spinner
+                    android:id="@+id/spinnerTotalDays"
+                    android:layout_width="80dp"
+                    android:layout_height="48dp"/>
                     android:id="@+id/npTotalDays"
                     android:layout_width="60dp"
                     android:layout_height="100dp"/>
@@ -123,4 +126,25 @@
         android:layout_marginBottom="8dp"
         android:gravity="center"/>
 
+    <!-- Calculation Info -->
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="※ 연차: -1일 / 반년: -0.5일 차감"
+        android:textSize="12sp"
+        android:textColor="@color/text_tertiary"
+        android:layout_marginBottom="24dp"
+        android:gravity="center"/>
+
+    <!-- Save Button -->
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btnSaveAnnualLeave"
+        android:layout_width="match_parent"
+        android:layout_height="56dp"
+        android:text="저장"
+        android:textSize="16sp"
+        android:textStyle="bold"
+        app:cornerRadius="12dp"
+        android:backgroundTint="@color/primary"/>
+
 </LinearLayout>