feat: 남은 연차 표시 및 달력 UI 개선 (넓은 화면, 큰 근무 표시)

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

@@ -99,7 +99,7 @@ class CalendarAdapter(
         holder.shiftChar.background = null
         holder.shiftChar.text = ""
         holder.holidayNameSmall.visibility = View.GONE
-        holder.shiftChar.textSize = 13f
+        holder.shiftChar.textSize = 15f
 
         // "반월", "반년" (Half-Monthly, Half-Yearly) Special Logic
         // These are overrides or specific shifts that user sets.
@@ -111,7 +111,7 @@ class CalendarAdapter(
             // Holiday Mode (Priority): Show full holiday name, no circle
             holder.shiftChar.text = fullHolidayName
             holder.shiftChar.setTextColor(Color.parseColor("#FF5252"))
-            holder.shiftChar.textSize = 10f
+                holder.shiftChar.textSize = 11f
             holder.shiftChar.background = null
         } else if (item.shift != null && item.shift != "비번") {
             // Shift Mode
@@ -120,7 +120,7 @@ class CalendarAdapter(
             if (item.shift == "반월" || item.shift == "반년") {
                  holder.shiftChar.text = if (item.shift == "반월") "월" else "년"
                  holder.shiftChar.setTextColor(ContextCompat.getColor(context, R.color.black)) // Black for contrast on Half Red/Transparent
-                 holder.shiftChar.textSize = 13f
+                 holder.shiftChar.textSize = 15f
                  holder.shiftChar.background = ContextCompat.getDrawable(context, R.drawable.bg_shift_half_red)
             } else {
                 // Standard Logic
@@ -137,7 +137,7 @@ class CalendarAdapter(
                     else -> item.shift.take(1)
                 }
                 holder.shiftChar.text = shiftAbbreviation
-                holder.shiftChar.textSize = 15f
+                holder.shiftChar.textSize = 17f
                 holder.shiftChar.setTypeface(null, android.graphics.Typeface.BOLD)
 
                 val shiftColorRes = when (item.shift) {
@@ -205,7 +205,7 @@ class CalendarAdapter(
              // holder.holidayNameSmall.text = HolidayManager.getLunarDateString(item.date)
              
              holder.shiftChar.text = HolidayManager.getLunarDateString(item.date)
-             holder.shiftChar.textSize = 10f
+             holder.shiftChar.textSize = 11f
              holder.shiftChar.setTextColor(ContextCompat.getColor(context, R.color.text_tertiary))
              holder.shiftChar.background = null
         }