kotlin upgraded, site started

site/build.gradle.kts

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+/*
+ * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+/*
+ * Compose HTML (JS-only) SPA module
+ */
+
+plugins {
+    alias(libs.plugins.kotlinMultiplatform)
+    // Compose compiler plugin for Kotlin 2.2.21 (matches version catalog)
+    id("org.jetbrains.kotlin.plugin.compose") version "2.2.21"
+    // Compose Multiplatform plugin for convenient dependencies (compose.html.core, etc.)
+    id("org.jetbrains.compose") version "1.9.3"
+}
+
+kotlin {
+    js(IR) {
+        browser {
+            commonWebpackConfig {
+                // Enable CSS handling
+                cssSupport {
+                    enabled.set(true)
+                }
+                // Ensure predictable output name so we can reference it from index.html
+                outputFileName = "site.js"
+            }
+        }
+        binaries.executable()
+    }
+
+    sourceSets {
+        val jsMain by getting {
+            dependencies {
+                implementation("org.jetbrains.compose.runtime:runtime:1.9.3")
+                implementation("org.jetbrains.compose.html:html-core:1.9.3")
+            }
+        }
+        val jsTest by getting {
+            dependencies {
+                implementation(libs.kotlin.test)
+            }
+        }
+    }
+}
+
+// Optional: configure toolchain if needed by the project; uses root Kotlin version from version catalog