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

@@ -20,10 +20,9 @@ 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 days: List<DayShift>,
+    private val listener: OnDayClickListener,
+    var showHolidays: Boolean = true
 ) : RecyclerView.Adapter<CalendarAdapter.ViewHolder>() {
     interface OnDayClickListener {
         fun onDayClick(date: LocalDate, currentShift: String)
@@ -48,28 +47,19 @@ class CalendarAdapter(
         return (dp * context.resources.displayMetrics.density).toInt()
     }
 
- override fun onBindViewHolder(holder: ViewHolder, position: Int) {
- val item = days[position]
- val context = holder.itemView.context
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        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
+        if (item.date == null) {
+            holder.itemView.visibility = View.INVISIBLE
+            return
+        }
 
- val layoutParams = holder.itemView.layoutParams
- layoutParams.height = itemHeight
- holder.itemView.layoutParams = layoutParams
-
- if (item.date == null) {
- holder.itemView.visibility = View.INVISIBLE
- return
- }
-
- holder.itemView.visibility = View.VISIBLE
-
- // Day Number
+        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

@@ -266,11 +266,10 @@ class MainActivity : AppCompatActivity() {
         return (dp * resources.displayMetrics.density).toInt()
     }
 
- private fun setupCalendar() {
- binding.calendarGrid.layoutManager = GridLayoutManager(this, 7)
- binding.calendarGrid.setHasFixedSize(false) // Allow dynamic item sizing
- updateCalendar()
- }
+    private fun setupCalendar() {
+        binding.calendarGrid.layoutManager = GridLayoutManager(this, 7)
+        updateCalendar()
+    }
 
     private fun updateCalendar() {
         val prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
@@ -306,36 +305,15 @@ class MainActivity : AppCompatActivity() {
                 dao.getMemosForMonth(monthStr).associateBy { memoItem -> memoItem.date }
             }
 
- val days = generateDaysForMonthWithData(currentViewMonth, currentViewTeam, factory, overrides, memos)
+            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.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
+            val adapter = CalendarAdapter(days, object : CalendarAdapter.OnDayClickListener {
+                override fun onDayClick(date: LocalDate, currentShift: String) {
+                    showDaySettingsDialog(date, currentShift)
+                }
+            }, binding.cbShowHolidays.isChecked)
             
+            binding.calendarGrid.adapter = adapter
             binding.monthTitle.text = currentViewMonth.format(DateTimeFormatter.ofPattern("yyyy년 MM월"))
 
             // Update Header Status Text with Permission Warning if needed