fix: DB 마이그레이션 추가 및 연차 저장/다크모드/달력 UI 개선

- DB 마이그레이션으로 기존 알람 데이터 보존
- 연차 저장 문제 수정 (원래대로/연차 설정 시 updateRemainingAnnualLeave 호출)
- 달력 5행 스크롤 없이 표시 (85dp 높이)
- 알람 편집/월년 선택 다크모드 지원
- 설정 앱정보 버전 동기화 표시

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

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

@@ -29,7 +29,7 @@
             android:text="알람 추가"
             android:textSize="18sp"
             android:textStyle="bold"
-            android:textColor="@color/black"
+        android:textColor="@color/text_primary"
             android:layout_centerInParent="true"/>
 
         <TextView
@@ -80,7 +80,7 @@
                 android:layout_height="wrap_content"
                 app:cardCornerRadius="24dp"
                 app:cardElevation="0dp"
-                app:cardBackgroundColor="@color/white"
+                app:cardBackgroundColor="@color/surface"
                 android:layout_marginBottom="16dp">
 
                 <LinearLayout
@@ -116,7 +116,7 @@
                 android:layout_height="wrap_content"
                 app:cardCornerRadius="24dp"
                 app:cardElevation="0dp"
-                app:cardBackgroundColor="@color/white"
+                app:cardBackgroundColor="@color/surface"
                 android:layout_marginBottom="16dp">
                 <LinearLayout
                     android:id="@+id/btnSelectSound"
@@ -162,7 +162,7 @@
                 android:layout_height="wrap_content"
                 app:cardCornerRadius="24dp"
                 app:cardElevation="0dp"
-                app:cardBackgroundColor="@color/white"
+                app:cardBackgroundColor="@color/surface"
                 android:layout_marginBottom="16dp">
                 <LinearLayout
                     android:layout_width="match_parent"

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

@@ -20,7 +20,7 @@
             android:text="날짜 이동"
             android:textSize="24sp"
             android:textStyle="bold"
-            android:textColor="@color/black"
+        android:textColor="@color/text_primary"
             android:layout_marginBottom="32dp"
             android:layout_gravity="center_horizontal"/>
 

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

@@ -361,5 +361,17 @@
             </LinearLayout>
         </androidx.cardview.widget.CardView>
 
+        <!-- App Version -->
+        <TextView
+            android:id="@+id/tvAppVersion"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="버전 1.4.0"
+            android:textColor="@color/text_tertiary"
+            android:textSize="12sp"
+            android:layout_gravity="center_horizontal"
+            android:layout_marginTop="8dp"
+            android:layout_marginBottom="16dp"/>
+
     </LinearLayout>
 </androidx.core.widget.NestedScrollView>

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

@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/dayRoot"
     android:layout_width="match_parent"
-    android:layout_height="108dp"
+    android:layout_height="85dp"
     android:background="@drawable/bg_grid_cell_v4">
 
     <!-- Day Number (top-left) -->