fix: 휴가관리 UI 정리 및 자동 저장 기능 추가

- 중복된 '연차: -1일 / 반년: -0.5일 차감' 텍스트 제거
- 중복된 Spinner/NumberPicker 뷰 정리
- 저장 버튼 제거하고 Spinner 선택 시 자동 저장되도록 개선
- 버전 업데이트 v1.4.6 (1146)

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 +4,19 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.AdapterView
 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?,
@@ -28,7 +31,6 @@ class FragmentSettingsLab : Fragment() {
         
         setupSpinner()
         loadAnnualLeave()
-        setupSaveButton()
     }
 
     private fun setupSpinner() {
@@ -37,10 +39,25 @@ class FragmentSettingsLab : Fragment() {
         val adapter = ArrayAdapter(requireContext(), android.R.layout.simple_spinner_item, daysList)
         adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
         binding.spinnerTotalDays.adapter = adapter
+        
+        // 선택 시 자동 저장
+        binding.spinnerTotalDays.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
+            override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
+                if (!isInitialLoad) {
+                    val totalDays = position + 1 // 0-indexed to actual days
+                    saveAnnualLeave(totalDays)
+                }
+            }
+            
+            override fun onNothingSelected(parent: AdapterView<*>?) {
+                // Do nothing
+            }
+        }
     }
 
     private fun loadAnnualLeave() {
         lifecycleScope.launch {
+            isInitialLoad = true
             val repo = ShiftRepository(requireContext())
             
             val annualLeave = repo.getAnnualLeave()
@@ -53,24 +70,23 @@ class FragmentSettingsLab : Fragment() {
                 binding.spinnerTotalDays.setSelection(14)
                 binding.tvRemainingDays.text = "15"
             }
+            
+            // 초기 로드 완료 후 플래그 변경 (약간의 딜레이로 초기 선택 이벤트 방지)
+            delay(300)
+            isInitialLoad = false
         }
     }
 
-    private fun setupSaveButton() {
-        binding.btnSaveAnnualLeave.setOnClickListener {
-            val selectedPosition = binding.spinnerTotalDays.selectedItemPosition
-            val totalDays = selectedPosition + 1 // 0-indexed to actual days
+    private fun saveAnnualLeave(totalDays: Int) {
+        lifecycleScope.launch {
+            val repo = ShiftRepository(requireContext())
             
-            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)")
-                }
+            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)")
             }
         }
     }