kotlin upgraded, site started

site/src/jsMain/kotlin/Main.kt

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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.
+ *
+ */
+
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import org.jetbrains.compose.web.dom.*
+import org.jetbrains.compose.web.renderComposable
+
+fun main() {
+    renderComposable(rootElementId = "root") {
+        // Minimal SPA shell
+        Div({ classes("container", "py-4") }) {
+            H1({ classes("display-6", "mb-3") }) { Text("Compose HTML SPA") }
+            P({ classes("lead") }) {
+                Text("This static site is powered by Compose for Web (JS-only) and Bootstrap 5.3.")
+            }
+
+            Hr()
+
+            // Example of interactive state to show SPA behavior
+            var count by remember { mutableStateOf(0) }
+            Div({ classes("d-flex", "gap-2", "align-items-center") }) {
+                Button(attrs = {
+                    classes("btn", "btn-primary")
+                    onClick { count++ }
+                }) { Text("Increment") }
+                Span({ classes("fw-bold") }) { Text("Count: $count") }
+            }
+        }
+    }
+}