feat: add self-chat (#13)

Reviewed-on: https://git.reya.su/reya/coop-mobile/pulls/13

composeApp/src/androidMain/kotlin/su/reya/coop/screens/ChatScreen.kt

@@ -1,6 +1,7 @@
 package su.reya.coop.screens
 
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.IntrinsicSize
@@ -47,6 +48,7 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import coop.composeapp.generated.resources.Res
 import coop.composeapp.generated.resources.ic_arrow_back
@@ -235,10 +237,15 @@ fun ChatScreen(id: Long) {
                                 .fillMaxWidth(),
                             contentAlignment = Alignment.Center
                         ) {
-                            Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                            Column(
+                                horizontalAlignment = Alignment.CenterHorizontally,
+                                verticalArrangement = Arrangement.spacedBy(4.dp),
+                            ) {
                                 Text(
                                     text = "No messages yet",
-                                    style = MaterialTheme.typography.titleLargeEmphasized,
+                                    style = MaterialTheme.typography.titleLargeEmphasized.copy(
+                                        fontWeight = FontWeight.SemiBold
+                                    ),
                                     color = MaterialTheme.colorScheme.onSurface
                                 )
                                 Text(