UI: 피드백 반영 — Placement/Donut/뒤로가기/토스트

[Placement]
- 복부 높이: 500dp→weight(1f) 유동, 스크롤 제거
- 화살표 크기: 50→70, head 20→28, stroke 7→9
- 6/6, 60% 비개발자 모드에서 제거
- Step indicator를 이미지 위로 이동

[Donut]
- Bladdy 크기: 80/110dp→120/150dp (비개발자)
- 도넛 크기: 260/320dp→300/360dp (비개발자)
- 볼륨 텍스트 배경 제거 (투명)
- 원 내부 흰색 반투명 배경 추가
- measuring 메시지 제거 (Auto 대기 중 표시 안 함)
- 배터리 옆 초록 connection dot 제거
- Volume 카드 제거, Fill/Level만 유지 (maxVolumeMl 기준)
- "빠른 저장"→"Quick Save" 영어 통일
- 측정 부족/미감지 토스트 제거

[기타]
- HOME 뒤로가기 → "Exit App?" 확인 다이얼로그

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

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

@@ -11,8 +11,12 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.Scaffold
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 import app.rive.runtime.kotlin.core.Rive
 import com.example.medilightv2android.services.KeychainService
@@ -62,7 +66,30 @@ fun MedilightApp(modifier: Modifier = Modifier) {
     val context = LocalContext.current
     val appState = remember { AppState(context) }
 
-    // Android 뒤로가기 = 바로 전 화면
+    // HOME에서 뒤로가기 → 앱 종료 확인
+    var showExitDialog by remember { mutableStateOf(false) }
+    BackHandler(enabled = appState.currentScreen == AppScreen.HOME) {
+        showExitDialog = true
+    }
+    if (showExitDialog) {
+        androidx.compose.material3.AlertDialog(
+            onDismissRequest = { showExitDialog = false },
+            title = { androidx.compose.material3.Text("Exit App") },
+            text = { androidx.compose.material3.Text("Are you sure you want to exit?") },
+            confirmButton = {
+                androidx.compose.material3.TextButton(onClick = { (context as? android.app.Activity)?.finish() }) {
+                    androidx.compose.material3.Text("Exit", color = Color.Red)
+                }
+            },
+            dismissButton = {
+                androidx.compose.material3.TextButton(onClick = { showExitDialog = false }) {
+                    androidx.compose.material3.Text("Cancel")
+                }
+            }
+        )
+    }
+
+    // 다른 화면에서 뒤로가기 = 바로 전 화면
     BackHandler(enabled = appState.currentScreen != AppScreen.HOME
             && appState.currentScreen != AppScreen.PIN_ENTRY) {
         when (appState.currentScreen) {

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

@@ -273,22 +273,12 @@ fun PiezoMonitoringView(appState: AppState) {
                         Log.w("PiezoMonitor", "No center channels: center=0 total=$totalWallCount/6")
                         bleManager.debugLogger.warn("BV_SKIP scan=${com.example.medilightv2android.services.AdcCsvLogger.lastScanId} center=0 total=$totalWallCount/6")
                         com.example.medilightv2android.services.AdcCsvLogger.log(rawADC, null)
-                        if (!isAutoMeasuring) {
-                            handler.post { android.widget.Toast.makeText(context,
-                                "측정 부족 (${centerWallCount}/4채널) — 센서 위치를 조절해주세요",
-                                android.widget.Toast.LENGTH_SHORT).show() }
-                        }
                     }
                 } else {
                     Log.d("PiezoMonitor", "No valid channels — volume unchanged")
                     bleManager.debugLogger.warn("BV_FAIL scan=${com.example.medilightv2android.services.AdcCsvLogger.lastScanId} no valid channels")
                     val failADC = channels.sortedBy { it.channel }.map { it.buffer }
                     com.example.medilightv2android.services.AdcCsvLogger.log(failADC, null)
-                    if (!isAutoMeasuring) {
-                        handler.post { android.widget.Toast.makeText(context,
-                            "방광이 감지되지 않았습니다. 센서 접촉을 확인해주세요.",
-                            android.widget.Toast.LENGTH_SHORT).show() }
-                    }
                 }
 
                 val finalRawVol = rawVolumeMl
@@ -575,7 +565,7 @@ fun PiezoMonitoringView(appState: AppState) {
                         ) {
                             Icon(Icons.Default.FlashOn, contentDescription = null, tint = Color(0xFF4CAF50))
                             Spacer(modifier = Modifier.width(12.dp))
-                            Text("빠른 저장", fontWeight = FontWeight.SemiBold, modifier = Modifier.weight(1f))
+                            Text("Quick Save", fontWeight = FontWeight.SemiBold, modifier = Modifier.weight(1f))
                             Text("$quickVol ml", color = MlSecondaryText, fontSize = 14.sp)
                             Spacer(modifier = Modifier.width(4.dp))
                             Icon(Icons.Default.ChevronRight, contentDescription = null, tint = MlSecondaryText)
@@ -707,7 +697,7 @@ fun PiezoMonitoringView(appState: AppState) {
             }
             Spacer(modifier = Modifier.weight(1f))
 
-            // Battery percentage
+            // Battery percentage (초록 dot 제거)
             if (!isDemoMode) {
                 val batteryColor = when {
                     batteryLvl >= 60 -> Color(0xFF4CAF50)
@@ -717,14 +707,6 @@ fun PiezoMonitoringView(appState: AppState) {
                 Text("$batteryLvl%", fontSize = 12.sp, fontWeight = FontWeight.Bold, color = batteryColor)
             }
 
-            // Connection dot
-            Box(
-                modifier = Modifier
-                    .size(8.dp)
-                    .clip(CircleShape)
-                    .background(if (isDemoMode || isConnected) Color(0xFF4CAF50) else Color.Red)
-            )
-
             Spacer(modifier = Modifier.width(4.dp))
 
             // Settings button
@@ -780,65 +762,57 @@ fun PiezoMonitoringView(appState: AppState) {
             val donutSize = if (appState.isDevMode) {
                 if (isCompact) 220.dp else 280.dp
             } else {
-                if (isCompact) 260.dp else 320.dp  // 일반 모드: 더 크게
+                if (isCompact) 300.dp else 360.dp  // 일반 모드: 화면 거의 가득
             }
-            // maxVolume 기준 비율 (0.0~1.0, 부드러운 연속값)
             val maxVolumeForDonut = appState.piezoSettings.maxVolume.toDouble()
             val donutProgress = if (maxVolumeForDonut > 0 && maxVolumeMl > 0)
                 (maxVolumeMl / maxVolumeForDonut).coerceIn(0.0, 1.0) else 0.0
             Box(contentAlignment = Alignment.Center) {
+                // 원 내부 흰색 톤 배경
+                if (!appState.isDevMode) {
+                    Box(
+                        modifier = Modifier
+                            .size(donutSize - 50.dp)
+                            .clip(CircleShape)
+                            .background(Color.White.copy(alpha = 0.5f))
+                    )
+                }
                 DonutChartView(
                     progress = donutProgress,
                     urgency = urgency,
-                    lineWidth = if (isCompact) 22.dp else 30.dp,
+                    lineWidth = if (appState.isDevMode) {
+                        if (isCompact) 22.dp else 30.dp
+                    } else {
+                        if (isCompact) 26.dp else 34.dp
+                    },
                     size = donutSize
                 )
                 Column(horizontalAlignment = Alignment.CenterHorizontally) {
-                    BladdyRiveView(urgency = urgency, size = if (isCompact) 80.dp else 110.dp)
+                    // Bladdy 크기: 일반 모드에서 더 크게
-                    Spacer(modifier = Modifier.height(4.dp))
+                    val bladdySize = if (appState.isDevMode) {
-                    if (isAutoMeasuring && autoVolumeWindow.size < 5 && lastVolumeMl <= 0) {
+                        if (isCompact) 80.dp else 110.dp
-                        // Auto 측정 대기 중 — trimmed mean 산출 전
-                        Row(
-                            verticalAlignment = Alignment.CenterVertically,
-                            modifier = Modifier
-                                .clip(RoundedCornerShape(12.dp))
-                                .background(MlCardBackground)
-                                .padding(horizontal = 14.dp, vertical = 6.dp)
-                        ) {
-                            CircularProgressIndicator(
-                                color = Color(0xFFFF9800),
-                                modifier = Modifier.size(16.dp),
-                                strokeWidth = 2.dp
-                            )
-                            Spacer(modifier = Modifier.width(8.dp))
-                            Text("Measuring... (${autoVolumeWindow.size}/5)",
-                                fontSize = 14.sp, fontWeight = FontWeight.SemiBold,
-                                color = Color(0xFFFF9800))
-                        }
                     } else {
-                        val volFontSize = if (appState.isDevMode) 18.sp else 22.sp
+                        if (isCompact) 120.dp else 150.dp  // 원 지름의 ~1/2
-                        Text(
-                            if (maxVolumeMl > 0) "${"%.0f".format(maxVolumeMl)} ml" else "${appState.estimatedVolume} ml",
-                            fontSize = volFontSize,
-                            fontWeight = FontWeight.Bold,
-                            color = urgency.accentColor,
-                            modifier = Modifier
-                                .clip(RoundedCornerShape(12.dp))
-                                .background(MlCardBackground)
-                                .shadow(4.dp, RoundedCornerShape(12.dp), spotColor = Color.Black.copy(alpha = 0.08f))
-                                .padding(horizontal = 16.dp, vertical = 8.dp)
-                        )
                     }
+                    BladdyRiveView(urgency = urgency, size = bladdySize)
+                    Spacer(modifier = Modifier.height(4.dp))
+                    // 볼륨 텍스트 — 배경 없이 깔끔하게
+                    val volFontSize = if (appState.isDevMode) 18.sp else 24.sp
+                    Text(
+                        if (maxVolumeMl > 0) "${"%.0f".format(maxVolumeMl)} ml" else "${appState.estimatedVolume} ml",
+                        fontSize = volFontSize,
+                        fontWeight = FontWeight.Bold,
+                        color = urgency.accentColor,
+                    )
                 }
             }
 
             // Info cards (Fill/Level은 maxVolume 기준)
             val maxVol = appState.piezoSettings.maxVolume.toDouble()
-            val fillPct = if (maxVol > 0 && lastVolumeMl > 0) (lastVolumeMl / maxVol * 100).coerceAtMost(100.0) else 0.0
+            // fill/level은 maxVolumeMl(세션 최대) 기준
-            val levelVal = if (maxVol > 0 && lastVolumeMl > 0) ((lastVolumeMl / maxVol) * BladderLevel.MAX_LEVEL).toInt().coerceIn(0, BladderLevel.MAX_LEVEL) else 0
+            val fillPct = if (maxVol > 0 && maxVolumeMl > 0) (maxVolumeMl / maxVol * 100).coerceAtMost(100.0) else 0.0
+            val levelVal = if (maxVol > 0 && maxVolumeMl > 0) ((maxVolumeMl / maxVol) * BladderLevel.MAX_LEVEL).toInt().coerceIn(0, BladderLevel.MAX_LEVEL) else 0
             Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-                val displayVol = if (lastVolumeMl > 0) "%.0f".format(lastVolumeMl) else "—"
-                InfoCard("Volume", displayVol, "ml", urgency.accentColor, Modifier.weight(1f))
                 InfoCard("Fill", if (fillPct > 0) "%.0f".format(fillPct) else "—", "%", urgency.accentColor, Modifier.weight(1f))
                 InfoCard("Level", if (levelVal > 0) "$levelVal/${BladderLevel.MAX_LEVEL}" else "—", "", urgency.accentColor, Modifier.weight(1f))
             }

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

@@ -167,16 +167,41 @@ fun PlacementGuideView(appState: AppState) {
         Column(
             modifier = Modifier
                 .fillMaxSize()
-                .verticalScroll(rememberScrollState())
                 .padding(horizontal = 24.dp),
             horizontalAlignment = Alignment.CenterHorizontally
         ) {
+            // Step indicator + mode badge (이미지 위에 배치)
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(8.dp),
+                modifier = Modifier.padding(vertical = 4.dp)
+            ) {
+                Text(
+                    text = when (placementPhase) {
+                        PlacementPhase.VERTICAL -> "Step 1/3"
+                        PlacementPhase.LATERAL -> "Step 2/3"
+                        PlacementPhase.GREEN -> "Step 3/3"
+                    },
+                    fontSize = 13.sp, fontWeight = FontWeight.SemiBold, color = MlSecondaryText
+                )
+                if (isSweepMode) {
+                    Text(
+                        "SWEEP",
+                        fontSize = 10.sp,
+                        fontWeight = FontWeight.Bold,
+                        color = Color.White,
+                        modifier = Modifier
+                            .background(Color(0xFF7C3AED), RoundedCornerShape(4.dp))
+                            .padding(horizontal = 6.dp, vertical = 1.dp)
+                    )
+                }
+            }
+
             // ── 하복부 Canvas 실루엣 + 센서 + 방향 가이드 ──
             Box(
                 modifier = Modifier
                     .fillMaxWidth()
-                    .height(500.dp)
+                    .weight(1f),
-                    .padding(top = 8.dp),
                 contentAlignment = Alignment.Center
             ) {
                 // 하복부 실루엣 (Canvas — CKLaw body silhouette)
@@ -278,10 +303,10 @@ fun PlacementGuideView(appState: AppState) {
                     // ── 방향 화살표 (방광 타원 바깥) ──
                     if (!greenZone) {
                         val arrowColor = Color(0xFFFF5722)
-                        val arrowLen = 50f
+                        val arrowLen = 70f
-                        val arrowHead = 20f
+                        val arrowHead = 28f
-                        val sw = 7f
+                        val sw = 9f
-                        val gap = 12f
+                        val gap = 14f
 
                         when {
                             directionIcon.contains("up") -> {
@@ -336,40 +361,41 @@ fun PlacementGuideView(appState: AppState) {
                     alpha = if (isGreenZone) 0.7f else 0.95f
                 )
 
-                // Score + 감지수 + R-fit (우측 상단)
+                // Score + 감지수 + R-fit (개발자 모드에서만)
-                Column(
+                if (appState.isDevMode) {
-                    modifier = Modifier
+                    Column(
-                        .align(Alignment.TopEnd)
+                        modifier = Modifier
-                        .padding(4.dp),
+                            .align(Alignment.TopEnd)
-                    horizontalAlignment = Alignment.End
+                            .padding(4.dp),
-                ) {
+                        horizontalAlignment = Alignment.End
-                    Text("$detectedCount/6", fontSize = 16.sp, fontWeight = FontWeight.Bold,
+                    ) {
-                        color = if (detectedCount >= 4) Color(0xFF4CAF50) else Color(0xFFFF9800))
+                        Text("$detectedCount/6", fontSize = 16.sp, fontWeight = FontWeight.Bold,
-                    if (placementScore > 0) {
+                            color = if (detectedCount >= 4) Color(0xFF4CAF50) else Color(0xFFFF9800))
-                        Text("$placementScore%", fontSize = 13.sp, fontWeight = FontWeight.Bold,
+                        if (placementScore > 0) {
-                            color = when {
+                            Text("$placementScore%", fontSize = 13.sp, fontWeight = FontWeight.Bold,
-                                placementScore >= 80 -> Color(0xFF4CAF50)
+                                color = when {
-                                placementScore >= 50 -> Color(0xFFFF9800)
+                                    placementScore >= 80 -> Color(0xFF4CAF50)
-                                else -> Color.Red
+                                    placementScore >= 50 -> Color(0xFFFF9800)
-                            })
+                                    else -> Color.Red
-                    }
+                                })
-                    // SWEEP 모드: R-fit + argmax 표시
-                    if (isSweepMode && currentRMm != null) {
-                        val rColor = when {
-                            bestRMm > 0 && (bestRMm - currentRMm!!) < 1.5 -> Color(0xFF4CAF50) // PEAK
-                            currentRMm!! > (bestRMm * 0.8) -> Color(0xFF7C3AED) // RISING
-                            else -> Color(0xFFFF9800) // FALLING/NOISE
                         }
-                        Text("R=${"%.0f".format(currentRMm)}mm", fontSize = 12.sp,
+                        if (isSweepMode && currentRMm != null) {
-                            fontWeight = FontWeight.Bold, color = rColor)
+                            val rColor = when {
-                        if (bestRMm > 0) {
+                                bestRMm > 0 && (bestRMm - currentRMm!!) < 1.5 -> Color(0xFF4CAF50)
-                            Text("best=${"%.0f".format(bestRMm)}", fontSize = 10.sp,
+                                currentRMm!! > (bestRMm * 0.8) -> Color(0xFF7C3AED)
-                                color = Color(0xFF4CAF50).copy(alpha = 0.7f))
+                                else -> Color(0xFFFF9800)
-                        }
+                            }
-                        sagittalArgMaxCh?.let { arg ->
+                            Text("R=${"%.0f".format(currentRMm)}mm", fontSize = 12.sp,
-                            Text("argmax=CH$arg", fontSize = 10.sp,
+                                fontWeight = FontWeight.Bold, color = rColor)
-                                fontWeight = FontWeight.Bold,
+                            if (bestRMm > 0) {
-                                color = if (arg == 0) Color(0xFF4CAF50) else Color(0xFFFF9800))
+                                Text("best=${"%.0f".format(bestRMm)}", fontSize = 10.sp,
+                                    color = Color(0xFF4CAF50).copy(alpha = 0.7f))
+                            }
+                            sagittalArgMaxCh?.let { arg ->
+                                Text("argmax=CH$arg", fontSize = 10.sp,
+                                    fontWeight = FontWeight.Bold,
+                                    color = if (arg == 0) Color(0xFF4CAF50) else Color(0xFFFF9800))
+                            }
                         }
                     }
                 }
@@ -414,33 +440,6 @@ fun PlacementGuideView(appState: AppState) {
                 }
             }
 
-            Spacer(modifier = Modifier.height(4.dp))
-
-            // Step indicator + mode badge
-            Row(
-                verticalAlignment = Alignment.CenterVertically,
-                horizontalArrangement = Arrangement.spacedBy(8.dp)
-            ) {
-                Text(
-                    text = when (placementPhase) {
-                        PlacementPhase.VERTICAL -> "Step 1/3"
-                        PlacementPhase.LATERAL -> "Step 2/3"
-                        PlacementPhase.GREEN -> "Step 3/3"
-                    },
-                    fontSize = 11.sp, color = MlSecondaryText
-                )
-                if (isSweepMode) {
-                    Text(
-                        "SWEEP",
-                        fontSize = 10.sp,
-                        fontWeight = FontWeight.Bold,
-                        color = Color.White,
-                        modifier = Modifier
-                            .background(Color(0xFF7C3AED), RoundedCornerShape(4.dp))
-                            .padding(horizontal = 6.dp, vertical = 1.dp)
-                    )
-                }
-            }
 
             // Per-channel echo graphs (개발자 모드에서만 표시)
             if (appState.isDevMode && lastChannelData.isNotEmpty()) {