Add voiding diary view + home icon navigation

VoidingDiaryView:
- Date-grouped record list (grouped by day)
- Shows volume/awake/sleep with icons and colors
- Method badge (수기/음성/카메라)
- Delete with confirmation dialog
- Total record count footer

Navigation changes:
- Piezo screen: ArrowBack → Home icon (집 아이콘)
- Piezo screen: 배뇨일지 icon (Description) added next to home
- NIRS screen: ArrowBack → Home icon
- AppScreen.VOIDING_DIARY route added to Crossfade navigation
- VoidingDiaryView navigates back to HOME

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/main/java/com/example/medilightv2android/AppState.kt

@@ -13,7 +13,8 @@ import com.example.medilightv2android.services.*
 enum class AppScreen {
     ONBOARDING, REGISTRATION, HOME, SENSOR_SELECT, DEVICE_SCAN,
     NIRS_CALIBRATION, PIEZO_PERSONALIZATION, PIN_SETUP, PIN_ENTRY,
-    VIVAMYO_MONITORING, PIEZO_MONITORING, MEASUREMENT_HISTORY
+    VIVAMYO_MONITORING, PIEZO_MONITORING, MEASUREMENT_HISTORY,
+    VOIDING_DIARY
 }
 
 class AppState(private val context: Context) {

app/src/main/java/com/example/medilightv2android/MainActivity.kt

@@ -23,6 +23,7 @@ import com.example.medilightv2android.ui.views.history.MeasurementHistoryView
 import com.example.medilightv2android.ui.views.home.HomeView
 import com.example.medilightv2android.ui.views.monitoring.PiezoMonitoringView
 import com.example.medilightv2android.ui.views.monitoring.VivamyoMonitoringView
+import com.example.medilightv2android.ui.views.monitoring.VoidingDiaryView
 import com.example.medilightv2android.ui.views.onboarding.OnboardingView
 import com.example.medilightv2android.ui.views.personalization.PiezoPersonalizationView
 import com.example.medilightv2android.ui.views.pin.PinMode
@@ -74,6 +75,7 @@ fun MedilightApp(modifier: Modifier = Modifier) {
             AppScreen.VIVAMYO_MONITORING -> VivamyoMonitoringView(appState)
             AppScreen.PIEZO_MONITORING -> PiezoMonitoringView(appState)
             AppScreen.MEASUREMENT_HISTORY -> MeasurementHistoryView(appState)
+            AppScreen.VOIDING_DIARY -> VoidingDiaryView(onBack = { appState.currentScreen = AppScreen.HOME })
         }
     }
 }

app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt

@@ -2,6 +2,7 @@ package com.example.medilightv2android.ui.views.monitoring
 
 import android.os.Handler
 import android.os.Looper
+import com.example.medilightv2android.AppScreen
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
@@ -170,7 +171,10 @@ fun PiezoMonitoringView(appState: AppState) {
             verticalAlignment = Alignment.CenterVertically
         ) {
             IconButton(onClick = { appState.goHome() }, modifier = Modifier.size(if (isCompact) 36.dp else 48.dp)) {
-                Icon(Icons.AutoMirrored.Filled.ArrowBack, "Back", tint = MlPrimary, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
+                Icon(Icons.Default.Home, "Home", tint = MlPrimary, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
+            }
+            IconButton(onClick = { appState.currentScreen = AppScreen.VOIDING_DIARY }, modifier = Modifier.size(if (isCompact) 36.dp else 48.dp)) {
+                Icon(Icons.Default.Description, "배뇨일지", tint = MlPrimary, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
             }
             if (!isCompact) {
                 Text("Bladder Monitor", fontSize = 20.sp, fontWeight = FontWeight.Bold, modifier = Modifier.padding(start = 8.dp))

app/src/main/java/com/example/medilightv2android/ui/views/monitoring/VivamyoMonitoringView.kt

@@ -240,7 +240,7 @@ fun VivamyoMonitoringView(appState: AppState) {
                 nirsManager.reset()
                 appState.goHome()
             }, modifier = Modifier.size(if (isCompact) 36.dp else 48.dp)) {
-                Icon(Icons.AutoMirrored.Filled.ArrowBack, "Back", tint = MlPrimary, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
+                Icon(Icons.Default.Home, "Home", tint = MlPrimary, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
             }
             Column(modifier = Modifier.padding(start = if (isCompact) 4.dp else 8.dp)) {
                 Text("Vivamyo", fontSize = if (isCompact) 16.sp else 20.sp, fontWeight = FontWeight.Bold)

app/src/main/java/com/example/medilightv2android/ui/views/monitoring/VoidingDiaryView.kt

@@ -0,0 +1,150 @@
+package com.example.medilightv2android.ui.views.monitoring
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.*
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import com.example.medilightv2android.measure.VoidingRecord
+import com.example.medilightv2android.measure.VoidingRecordStore
+import java.text.SimpleDateFormat
+import java.util.*
+
+/**
+ * 배뇨일지 목록 화면 — 로컬 기록 조회
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun VoidingDiaryView(onBack: () -> Unit) {
+    val context = LocalContext.current
+    var records by remember { mutableStateOf(VoidingRecordStore.getAll(context).sortedByDescending { it.timestamp }) }
+    var showDeleteConfirm by remember { mutableStateOf<String?>(null) }
+
+    val grouped = remember(records) {
+        records.groupBy { SimpleDateFormat("yyyy-MM-dd", Locale.getDefault()).format(Date(it.timestamp)) }
+    }
+
+    Scaffold(
+        topBar = {
+            TopAppBar(
+                title = { Text("배뇨일지", fontWeight = FontWeight.SemiBold) },
+                navigationIcon = {
+                    IconButton(onClick = onBack) { Icon(Icons.Default.ArrowBack, "뒤로") }
+                }
+            )
+        }
+    ) { padding ->
+        if (records.isEmpty()) {
+            Box(Modifier.fillMaxSize().padding(padding), contentAlignment = Alignment.Center) {
+                Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                    Icon(Icons.Default.Description, null, Modifier.size(48.dp), Color.Gray.copy(alpha = 0.5f))
+                    Spacer(Modifier.height(8.dp))
+                    Text("기록이 없습니다", color = Color.Gray)
+                }
+            }
+        } else {
+            LazyColumn(
+                Modifier.fillMaxSize().padding(padding),
+                contentPadding = PaddingValues(16.dp),
+                verticalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                grouped.forEach { (date, dayRecords) ->
+                    item {
+                        val displayDate = try {
+                            val d = SimpleDateFormat("yyyy-MM-dd", Locale.getDefault()).parse(date)
+                            SimpleDateFormat("M월 d일 (E)", Locale.KOREA).format(d!!)
+                        } catch (_: Exception) { date }
+
+                        Text(displayDate, fontWeight = FontWeight.Bold, fontSize = 15.sp,
+                            modifier = Modifier.padding(top = 8.dp, bottom = 4.dp))
+                    }
+
+                    items(dayRecords, key = { it.id }) { record ->
+                        Row(
+                            modifier = Modifier.fillMaxWidth()
+                                .background(Color.Gray.copy(alpha = 0.08f), RoundedCornerShape(8.dp))
+                                .padding(horizontal = 12.dp, vertical = 10.dp),
+                            verticalAlignment = Alignment.CenterVertically
+                        ) {
+                            Text(record.timeString, fontFamily = FontFamily.Monospace, color = Color.Gray,
+                                modifier = Modifier.width(50.dp))
+                            Spacer(Modifier.width(8.dp))
+
+                            when {
+                                record.volume != null -> {
+                                    Icon(Icons.Default.WaterDrop, null, Modifier.size(16.dp), Color(0xFF007AFF))
+                                    Spacer(Modifier.width(4.dp))
+                                    Text("${record.volume} ml", fontWeight = FontWeight.SemiBold)
+                                }
+                                record.activity == "awake" -> {
+                                    Icon(Icons.Default.WbSunny, null, Modifier.size(16.dp), Color(0xFFFF9800))
+                                    Spacer(Modifier.width(4.dp))
+                                    Text("기상")
+                                }
+                                record.activity == "sleep" -> {
+                                    Icon(Icons.Default.DarkMode, null, Modifier.size(16.dp), Color(0xFF9C27B0))
+                                    Spacer(Modifier.width(4.dp))
+                                    Text("취침")
+                                }
+                            }
+
+                            Spacer(Modifier.weight(1f))
+
+                            // 입력 방식 뱃지
+                            val methodLabel = when (record.method) {
+                                "voice" -> "음성"
+                                "camera" -> "카메라"
+                                else -> "수기"
+                            }
+                            Text(methodLabel, fontSize = 10.sp, color = Color.Gray,
+                                modifier = Modifier.background(Color.Gray.copy(alpha = 0.15f), RoundedCornerShape(4.dp))
+                                    .padding(horizontal = 6.dp, vertical = 2.dp))
+
+                            Spacer(Modifier.width(8.dp))
+
+                            // 삭제
+                            IconButton(onClick = { showDeleteConfirm = record.id }, modifier = Modifier.size(24.dp)) {
+                                Icon(Icons.Default.Delete, "삭제", Modifier.size(16.dp), Color.Gray)
+                            }
+                        }
+                    }
+                }
+
+                item {
+                    Spacer(Modifier.height(16.dp))
+                    Text("총 ${records.size}건", color = Color.Gray, fontSize = 12.sp,
+                        modifier = Modifier.fillMaxWidth(), textAlign = androidx.compose.ui.text.style.TextAlign.Center)
+                }
+            }
+        }
+    }
+
+    // 삭제 확인
+    showDeleteConfirm?.let { id ->
+        AlertDialog(
+            onDismissRequest = { showDeleteConfirm = null },
+            title = { Text("기록 삭제") },
+            text = { Text("이 기록을 삭제하시겠습니까?") },
+            confirmButton = {
+                TextButton(onClick = {
+                    VoidingRecordStore.delete(context, id)
+                    records = VoidingRecordStore.getAll(context).sortedByDescending { it.timestamp }
+                    showDeleteConfirm = null
+                }) { Text("삭제", color = Color.Red) }
+            },
+            dismissButton = { TextButton(onClick = { showDeleteConfirm = null }) { Text("취소") } }
+        )
+    }
+}