feat: consent screen, reminder system, medical metrics, sex field, design tokens, code quality

A. Reminder: ReminderService (AlarmManager chain), ReminderSettingsView,
   bell icon in Piezo top bar, reschedule on catheterization
B. Consent: ConsentView (3 mandatory items), onboarding→consent→registration flow,
   persistent consent storage, sex field in User + Registration Step 2
C. Diary: 24hUV, NUV, NPI, max capacity, day/night frequency metrics card
D. Design: DesignTokens.kt, 48dp touch targets, DonutChart semantics, pressScale modifier
E. Quality: BuildConfig.DEBUG log wrapping, DateFormatter caching, background I/O for diary store

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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

@@ -11,11 +11,10 @@ import com.example.medilightv2android.models.*
 import com.example.medilightv2android.services.*
 
 enum class AppScreen {
-    ONBOARDING, REGISTRATION, HOME, SENSOR_SELECT, DEVICE_SCAN,
+    ONBOARDING, CONSENT, REGISTRATION, HOME, SENSOR_SELECT, DEVICE_SCAN,
     NIRS_CALIBRATION, PIEZO_PERSONALIZATION, PIN_SETUP, PIN_ENTRY,
     VIVAMYO_MONITORING, PIEZO_MONITORING, MEASUREMENT_HISTORY,
-    VOIDING_DIARY,
-    URINE_CAMERA
+    VOIDING_DIARY, URINE_CAMERA, REMINDER_SETTINGS
 }
 
 class AppState(private val context: Context) {
@@ -32,6 +31,7 @@ class AppState(private val context: Context) {
     private val historyStore = MeasurementHistoryStore.getInstance(context)
     private val notificationService = NotificationService.getInstance(context)
     private val bleManager = BleManager.getInstance(context)
+    private val reminderService = ReminderService.getInstance(context)
 
     init {
         loadState()
@@ -49,6 +49,7 @@ class AppState(private val context: Context) {
 
         currentScreen = when {
             !storage.hasCompletedOnboarding -> AppScreen.ONBOARDING
+            !storage.hasConsented -> AppScreen.CONSENT
             !storage.isRegistered -> AppScreen.REGISTRATION
             !storage.hasPin -> AppScreen.PIN_SETUP
             else -> AppScreen.PIN_ENTRY
@@ -57,6 +58,12 @@ class AppState(private val context: Context) {
 
     fun completeOnboarding() {
         storage.hasCompletedOnboarding = true
+        currentScreen = AppScreen.CONSENT
+    }
+
+    fun completeConsent() {
+        storage.hasConsented = true
+        storage.consentTimestamp = System.currentTimeMillis()
         currentScreen = AppScreen.REGISTRATION
     }
 
@@ -164,6 +171,7 @@ class AppState(private val context: Context) {
         bladderLevel = newLevel
         storage.bladderLevel = 0
         notificationService.cancelAll()
+        reminderService.reschedule()
 
         if (catheterCount.intValue > 0) {
             catheterCount.intValue--