brand(art): wire Messages-empty (A8) + Bucket List-empty (A6); add BrandIllustration helper

EmptyState already supports illustrationResId (rounded-tile clip), so Bucket List just
passes illustration_bucket_list_empty. Messages inbox gained a proper empty state
("Your private conversation starts here") with illustration_messages_empty. Added
BrandIllustration() helper (theme-safe rounded tile / tile=false for transparent art)
for the upcoming header/hero placements. Verified live both themes: rounded illustration
tile reads cleanly on dark (card) and light (white card on blush); 0 FATAL.

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

app/src/main/java/app/closer/ui/components/BrandIllustration.kt

@@ -0,0 +1,49 @@
+package app.closer.ui.components
+
+import androidx.annotation.DrawableRes
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.border
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+
+/**
+ * Brand illustration that reads on BOTH the light and dark themes.
+ *
+ * Most of the generated empty-state / header illustrations ship with a soft
+ * near-white background; rendered raw on the dark (aubergine) theme that background
+ * would float as a pale block. Clipping to a generous rounded tile with a hairline
+ * outline turns it into an intentional, modern illustration card on either surface.
+ *
+ * Transparent art (e.g. the pairing-success celebration) should pass [tile] = false
+ * so it floats freely with no card edge.
+ */
+@Composable
+fun BrandIllustration(
+    @DrawableRes res: Int,
+    contentDescription: String?,
+    modifier: Modifier = Modifier,
+    tile: Boolean = true,
+    cornerRadius: Dp = 28.dp,
+) {
+    val shape = RoundedCornerShape(cornerRadius)
+    val shaped = if (tile) {
+        modifier
+            .clip(shape)
+            .border(1.dp, MaterialTheme.colorScheme.outline.copy(alpha = 0.10f), shape)
+    } else {
+        modifier
+    }
+    Image(
+        painter = painterResource(res),
+        contentDescription = contentDescription,
+        contentScale = ContentScale.Fit,
+        modifier = shaped,
+    )
+}

app/src/main/java/app/closer/ui/dates/BucketListScreen.kt

@@ -276,6 +276,7 @@ private fun BucketListItems(
         app.closer.ui.components.EmptyState(
             title = "Your shared list is empty",
             body = "Add something you've been dreaming about doing together — big or small. Tap + to start.",
+            illustrationResId = app.closer.R.drawable.illustration_bucket_list_empty,
             modifier = Modifier.padding(top = 80.dp)
         )
         return

app/src/main/java/app/closer/ui/messages/MessagesInboxScreen.kt

@@ -30,8 +30,10 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
+import app.closer.R
 import app.closer.core.navigation.AppRoute
 import app.closer.domain.model.Conversation
+import app.closer.ui.components.EmptyState
 import app.closer.ui.theme.CloserPalette
 import coil.compose.AsyncImage
 import java.util.concurrent.TimeUnit
@@ -74,6 +76,21 @@ fun MessagesInboxScreen(
             return
         }
 
+        if (state.conversations.isEmpty()) {
+            Column(
+                modifier = Modifier.fillMaxSize().padding(24.dp),
+                verticalArrangement = Arrangement.Center,
+                horizontalAlignment = Alignment.CenterHorizontally
+            ) {
+                EmptyState(
+                    title = "Your private conversation starts here",
+                    body = "Say hi, share a thought, or pick a question to talk through together. Everything you send stays end-to-end encrypted, just for the two of you.",
+                    illustrationResId = R.drawable.illustration_messages_empty
+                )
+            }
+            return
+        }
+
         LazyColumn(
             modifier = Modifier.fillMaxSize(),
             contentPadding = PaddingValues(vertical = 4.dp)