DEV: 측정 모드 직진입 버튼 + Start 라우팅 fix

빌드 104-105 적용:
- DeviceScanView "No devices found" 화면에 dev 모드 한정 "Enter Measurement Mode" 버튼 추가 (BLE 없이 디자인 작업용)
- AppState.startFromHome() 라우팅 fix — 페어링 후 Personalization → Back → HOME → Start 시 Monitoring 직행 버그를 PIEZO_PERSONALIZATION 부터 시작하도록 변경

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -96,7 +96,8 @@ class AppState(private val context: Context) {
     fun startFromHome() {
         sensorMode = SensorMode.PIEZO
         storage.sensorMode = SensorMode.PIEZO
-        currentScreen = if (isDeviceConnected) AppScreen.PIEZO_MONITORING else AppScreen.DEVICE_SCAN
+        // 페어링 완료 상태에서도 Personalization부터 시작해야 함 — Monitoring 직행 버그 fix
+        currentScreen = if (isDeviceConnected) AppScreen.PIEZO_PERSONALIZATION else AppScreen.DEVICE_SCAN
     }
 
     fun selectSensor(mode: SensorMode) {

app/src/main/java/com/example/medilightv2android/ui/views/connection/DeviceScanView.kt

@@ -259,6 +259,21 @@ fun DeviceScanView(appState: AppState) {
                         TroubleshootItem("4.", "Try restarting the device")
                     }
                 }
+                // DEV: BLE 없이 측정 모드 진입 — 디자인 작업용
+                if (appState.isDevMode) {
+                    Spacer(modifier = Modifier.height(16.dp))
+                    Button(
+                        onClick = {
+                            appState.isDeviceConnected = true
+                            appState.currentScreen = com.example.medilightv2android.AppScreen.PIEZO_PERSONALIZATION
+                        },
+                        modifier = Modifier.fillMaxWidth().height(48.dp),
+                        shape = RoundedCornerShape(12.dp),
+                        colors = ButtonDefaults.buttonColors(containerColor = MlPrimary.copy(alpha = 0.15f))
+                    ) {
+                        Text("Enter Measurement Mode (Dev)", color = MlPrimary, fontWeight = FontWeight.SemiBold)
+                    }
+                }
             }
         } else {
             LazyColumn(