feat: Implement dynamic icon and text colors based on background luminance for improved accessibility

app/src/main/java/com/rosetta/messenger/ui/chats/ChatDetailScreen.kt

@@ -898,7 +898,7 @@ fun ChatDetailScreen(
                                                                                         contentDescription =
                                                                                                 "Call",
                                                                                         tint =
-                                                                                                Color.White
+                                                                                                if (isDarkTheme) Color.White else Color(0xFF007AFF)
                                                                                 )
                                                                         }
                                                                 }
@@ -931,7 +931,7 @@ fun ChatDetailScreen(
                                                                                         contentDescription =
                                                                                                 "More",
                                                                                         tint =
-                                                                                                Color.White,
+                                                                                                if (isDarkTheme) Color.White else Color(0xFF007AFF),
                                                                                         modifier =
                                                                                                 Modifier.size(
                                                                                                         26.dp

app/src/main/java/com/rosetta/messenger/ui/chats/ChatsListScreen.kt

@@ -94,6 +94,15 @@ data class AvatarColors(val textColor: Color, val backgroundColor: Color)
 
 private val avatarColorCache = mutableMapOf<String, AvatarColors>()
 
+/**
+ * Определяет, является ли цвет светлым (true) или темным (false)
+ * Использует формулу relative luminance из WCAG
+ */
+fun isColorLight(color: Color): Boolean {
+    val luminance = 0.299f * color.red + 0.587f * color.green + 0.114f * color.blue
+    return luminance > 0.5f
+}
+
 fun getAvatarColor(name: String, isDarkTheme: Boolean): AvatarColors {
         val cacheKey = "${name}_${if (isDarkTheme) "dark" else "light"}"
         return avatarColorCache.getOrPut(cacheKey) {
@@ -453,7 +462,7 @@ fun ChatsListScreen(
                                                                                 text = accountName,
                                                                                 fontSize = 16.sp,
                                                                                 fontWeight = FontWeight.SemiBold,
-                                                                                color = Color.White
+                                                                                color = if (isColorLight(headerColor)) Color.Black else Color.White
                                                                         )
                                                                 }
 
@@ -465,11 +474,7 @@ fun ChatsListScreen(
                                                                                         "@$accountUsername",
                                                                                 fontSize = 13.sp,
                                                                                 color =
-                                                                                        Color.White
-                                                                                                .copy(
-                                                                                                        alpha =
-                                                                                                                0.7f
-                                                                                                )
+                                                                                        if (isColorLight(headerColor)) Color.Black.copy(alpha = 0.7f) else Color.White.copy(alpha = 0.7f)
                                                                         )
                                                                 }
                                                         }