fix: 달력 동적 높이 계산 제거 (1.3.0 스타일로 복원)

- RecyclerView 높이 동적 계산 코드 제거
- CalendarAdapter rowCount 파라미터 제거
- 아이템 높이를 XML에서 고정하도록 변경
- 달력이 자연스럽게 화면에 채워지도록 개선

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/CalendarAdapter.kt

@@ -22,8 +22,7 @@ data class DayShift(
 class CalendarAdapter(
     var days: List<DayShift>,
     private val listener: OnDayClickListener,
- var showHolidays: Boolean = true,
- private val rowCount: Int = 6 // Default to 6 rows
+    var showHolidays: Boolean = true
 ) : RecyclerView.Adapter<CalendarAdapter.ViewHolder>() {
     interface OnDayClickListener {
         fun onDayClick(date: LocalDate, currentShift: String)
@@ -52,15 +51,6 @@ class CalendarAdapter(
         val item = days[position]
         val context = holder.itemView.context
 
- // Fixed item height - square cells based on screen width
- val displayMetrics = context.resources.displayMetrics
- val screenWidth = displayMetrics.widthPixels
- val itemHeight = screenWidth / 7
-
- val layoutParams = holder.itemView.layoutParams
- layoutParams.height = itemHeight
- holder.itemView.layoutParams = layoutParams
-
         if (item.date == null) {
             holder.itemView.visibility = View.INVISIBLE
             return
@@ -69,7 +59,7 @@ class CalendarAdapter(
         holder.itemView.visibility = View.VISIBLE
 
         // Day Number
-        
+        holder.dayNumber.text = item.date.dayOfMonth.toString()
         // Holiday / Weekend logic
         val isSunday = item.date.dayOfWeek == java.time.DayOfWeek.SUNDAY
         val isSaturday = item.date.dayOfWeek == java.time.DayOfWeek.SATURDAY

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

@@ -268,7 +268,6 @@ class MainActivity : AppCompatActivity() {
 
     private fun setupCalendar() {
         binding.calendarGrid.layoutManager = GridLayoutManager(this, 7)
- binding.calendarGrid.setHasFixedSize(false) // Allow dynamic item sizing
         updateCalendar()
     }
 
@@ -308,34 +307,13 @@ class MainActivity : AppCompatActivity() {
 
             val days = generateDaysForMonthWithData(currentViewMonth, currentViewTeam, factory, overrides, memos)
 
- // Calculate row count (5 or 6 rows)
- val daysInMonth = currentViewMonth.lengthOfMonth()
- val firstDayOfMonth = currentViewMonth.atDay(1).dayOfWeek.value % 7
- val actualDayCount = firstDayOfMonth + daysInMonth
- val rowCount = if (actualDayCount <= 35) 5 else 6
-
             val adapter = CalendarAdapter(days, object : CalendarAdapter.OnDayClickListener {
                 override fun onDayClick(date: LocalDate, currentShift: String) {
                     showDaySettingsDialog(date, currentShift)
                 }
- }, binding.cbShowHolidays.isChecked, rowCount)
+            }, binding.cbShowHolidays.isChecked)
             
             binding.calendarGrid.adapter = adapter
-
- // Set RecyclerView height based on row count
- // 5 rows: fixed height to fill space, no scroll
- // 6 rows: max height (5 rows worth), enable scroll
- val displayMetrics = resources.displayMetrics
- val screenWidth = displayMetrics.widthPixels
- val cellHeight = screenWidth / 7 // Square cells
- val recyclerViewHeight = cellHeight * rowCount
- val layoutParams = binding.calendarGrid.layoutParams
- layoutParams.height = recyclerViewHeight
- binding.calendarGrid.layoutParams = layoutParams
-
- // Disable scroll for 5 rows, enable for 6 rows
- binding.calendarGrid.isNestedScrollingEnabled = rowCount > 5
-
             binding.monthTitle.text = currentViewMonth.format(DateTimeFormatter.ofPattern("yyyy년 MM월"))
 
             // Update Header Status Text with Permission Warning if needed