Fix line spacing compile error (TextUnit addition), bump to 0.1.16

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

build.gradle.kts

@@ -6,7 +6,7 @@ plugins {
 }
 
 group = "com.tpuahsiew.wirc"
-version = "0.1.15"
+version = "0.1.16"
 
 // No project-level repositories{} block here: settings.gradle.kts sets
 // dependencyResolutionManagement.repositoriesMode = FAIL_ON_PROJECT_REPOS and already
@@ -40,7 +40,7 @@ compose.desktop {
             appResourcesRootDir.set(project.file("installerResources"))
             targetFormats(TargetFormat.Msi, TargetFormat.Exe)
             packageName = "wIRC"
-            packageVersion = "0.1.15"
+            packageVersion = "0.1.16"
             windows {
                 menuGroup = "wIRC"
                 upgradeUuid = "8f14e45f-ceea-4a5e-9c3b-5b1f0e8c2b7a"

src/main/kotlin/ui/ChannelScreen.kt

@@ -862,7 +862,7 @@ fun MessageScrollback(
                 fontSize = displaySettings.fontSize.sp
             )
             val naturalPx = textMeasurer.measure(text = "Mg", style = base).size.height
-            val spacedLine = with(density) { naturalPx.toSp() } + (displaySettings.fontSize * LINE_SPACING_EXTRA).sp
+            val spacedLine = with(density) { (naturalPx + (displaySettings.fontSize * LINE_SPACING_EXTRA).sp.toPx()).toSp() }
             base.copy(
                 lineHeight = spacedLine,
                 lineHeightStyle = androidx.compose.ui.text.style.LineHeightStyle(