HTML artifacts: render agent-sent HTML/CSS/JS code blocks in an in-app WebView (Android platform WebView, desktop JCEF/KCEF) via a full-screen preview; artifact card with Preview button + code toggle, shown only once the message stops streaming; webview-multiplatform 1.9.40 + KCEF deps, detection + unit tests

app/shared/build.gradle.kts

@@ -10,6 +10,11 @@ val composeVersion = "1.7.3"
 val coroutinesVersion = "1.9.0"
 val serializationVersion = "1.7.3"
 val okhttpVersion = "4.12.0"
+// Pinned to 1.9.40: the last release built against Compose 1.7.x (1.7.1);
+// 2.0.x moves to Compose 1.8+. HTML artifact previews (M9): Android uses the
+// platform WebView, desktop uses KCEF (JCEF/Chromium, downloaded on first use).
+val webviewVersion = "1.9.40"
+val kcefVersion = "2024.04.20.3"
 // Pinned to 0.33.0: the last release built against Compose 1.7.x / Kotlin 2.1.x
 // (0.34.0+ moves to Compose 1.8+). Provides GFM tables, bold/italic/underscore,
 // and the -code module for language-aware syntax highlighting (Highlights).
@@ -45,10 +50,19 @@ kotlin {
             implementation("com.mikepenz:multiplatform-markdown-renderer:$markdownVersion")
             implementation("com.mikepenz:multiplatform-markdown-renderer-m3:$markdownVersion")
             implementation("com.mikepenz:multiplatform-markdown-renderer-code:$markdownVersion")
+            // M9: HTML artifact previews — WebView composable (platform WebView
+            // on Android, KCEF/JCEF on desktop).
+            implementation("io.github.kevinnzou:compose-webview-multiplatform:$webviewVersion")
         }
         commonTest.dependencies {
             implementation(kotlin("test"))
         }
+        // M9: KCEF (JCEF/Chromium) for desktop HTML artifact previews. The
+        // webview library exposes it transitively, but we reference KCEF
+        // directly (init + progress) so declare it explicitly.
+        desktopMain.dependencies {
+            implementation("dev.datlag:kcef:$kcefVersion")
+        }
         // M4: ExoPlayer (Media3) for inline audio/video playback (Android only).
         androidMain.dependencies {
             // M7: EncryptedSharedPreferences for the pairing token