brand(art): pairing-success hero -> A1 celebration; Security header -> A11 privacy-lock

PairingSuccessScreen replaces the white-keyhole app-icon chip joining the two partner
avatars with the illustration_pairing_success celebration (transparent, tile=false,
keeps the spring + pulse) so the "you're connected" beat shows the mark resolving with a
burst of hearts. SecurityScreen gains the illustration_privacy_recovery scene at the top.
Verified live: Security on dark (warm privacy-lock, not cold vault); A1 confirmed in the
debug gallery (transparent floats cleanly). 0 FATAL. Pairing-success needs a fresh pairing
to see in situ; A1 render proven via gallery.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/src/main/java/app/closer/ui/pairing/PairingSuccessScreen.kt

@@ -42,6 +42,7 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.graphics.Color
+import app.closer.ui.components.BrandIllustration
 import app.closer.ui.components.CelebrationOverlay
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -198,32 +199,18 @@ fun PairingSuccessScreen(
                     .align(Alignment.CenterEnd)
                     .zIndex(1f)
             )
-            Box(
+            // Celebration: the Closer mark resolving into place with a burst of hearts,
+            // floating over where the two partners meet.
+            BrandIllustration(
+                res = R.drawable.illustration_pairing_success,
+                contentDescription = null,
+                tile = false,
                 modifier = Modifier
-                    .size(60.dp)
+                    .size(132.dp)
                     .zIndex(2f)
                     .align(Alignment.Center)
                     .scale(pulse)
-                    .clip(CircleShape)
-                    .background(MaterialTheme.colorScheme.background)
-                    .padding(4.dp)
-                    .clip(CircleShape),
-                contentAlignment = Alignment.Center
-            ) {
-                // White-keyhole app-icon chip: aubergine gradient + the brand mark.
-                Image(
-                    painter = painterResource(R.drawable.ic_launcher_background),
-                    contentDescription = null,
-                    contentScale = ContentScale.Crop,
-                    modifier = Modifier.matchParentSize()
             )
-                Image(
-                    painter = painterResource(R.drawable.ic_launcher_foreground),
-                    contentDescription = null,
-                    contentScale = ContentScale.Fit,
-                    modifier = Modifier.matchParentSize()
-                )
-            }
         }
 
         Spacer(Modifier.height(32.dp))

app/src/main/java/app/closer/ui/settings/SecurityScreen.kt

@@ -7,7 +7,9 @@ import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.navigationBarsPadding
@@ -43,7 +45,9 @@ import androidx.fragment.app.FragmentActivity
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import app.closer.R
 import app.closer.data.local.RecoveryPhraseStore
+import app.closer.ui.components.BrandIllustration
 import app.closer.domain.repository.SettingsRepository
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -161,6 +165,14 @@ fun SecurityScreen(
                 .padding(horizontal = 16.dp, vertical = 8.dp),
             verticalArrangement = Arrangement.spacedBy(12.dp)
         ) {
+            Box(modifier = Modifier.fillMaxWidth(), contentAlignment = Alignment.Center) {
+                BrandIllustration(
+                    res = R.drawable.illustration_privacy_recovery,
+                    contentDescription = null,
+                    modifier = Modifier.size(150.dp).padding(vertical = 4.dp)
+                )
+            }
+
             Card(
                 modifier = Modifier.fillMaxWidth(),
                 shape = RoundedCornerShape(16.dp),