Add function to format settings trailing item

composeApp/src/androidJvmMain/kotlin/com/joaomanaia/game2048/core/util/StringUtil.androidJvm.kt

@@ -0,0 +1,7 @@
+package com.joaomanaia.game2048.core.util
+
+import kotlin.text.format
+
+actual fun formatSettingTrailingNumber(value: Float): String {
+    return "%.2f".format(value)
+}

composeApp/src/commonMain/kotlin/com/joaomanaia/game2048/core/util/StringUtil.kt

@@ -0,0 +1,3 @@
+package com.joaomanaia.game2048.core.util
+
+expect fun formatSettingTrailingNumber(value: Float): String

composeApp/src/commonMain/kotlin/com/joaomanaia/game2048/presentation/color_settings/ColorSettingsScreen.kt

@@ -49,6 +49,7 @@ import androidx.navigation.NavController
 import com.joaomanaia.game2048.core.presentation.theme.DarkThemeConfig
 import com.joaomanaia.game2048.core.presentation.theme.TileColorsGenerator
 import com.joaomanaia.game2048.core.presentation.theme.spacing
+import com.joaomanaia.game2048.core.util.formatSettingTrailingNumber
 import com.joaomanaia.game2048.presentation.color_settings.components.BaseColorChooser
 import com.joaomanaia.game2048.presentation.color_settings.components.DarkThemeDialogPicker
 import com.joaomanaia.game2048.presentation.components.BackIconButton
@@ -247,9 +248,7 @@ private fun SettingsItemSlider(
     value: Float,
     icon: @Composable (() -> Unit)? = null,
     onValueChange: (Float) -> Unit,
-    // TODO: create a format function
-    formatTrailingText: (Float) -> String = { it.toString() }
-//    formatTrailingText: (Float) -> String = { "%.2f".format(it) }
+    formatTrailingText: (Float) -> String = { formatSettingTrailingNumber(it) }
 ) {
     ListItem(
         modifier = modifier,

composeApp/src/wasmJsMain/kotlin/com/joaomanaia/game2048/core/util/StringUtil.wasmJs.kt

@@ -0,0 +1,12 @@
+package com.joaomanaia.game2048.core.util
+
+actual fun formatSettingTrailingNumber(value: Float): String {
+    val integerPart = value.toInt()
+    val decimalPart = ((value - integerPart) * 100).toInt()
+
+    return if (decimalPart < 10) {
+        "$integerPart.0$decimalPart"
+    } else {
+        "$integerPart.$decimalPart"
+    }
+}