new: integrate pages for deepen and about

shared/src/jvmMain/kotlin/fr/ajaury/gwenedeg/web/ui/PlatformWebView.jvm.kt

@@ -0,0 +1,14 @@
+package fr.ajaury.gwenedeg.web.ui
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+
+@Composable
+actual fun PlatformWebView(
+    url: String,
+    darkTheme: Boolean,
+    modifier: Modifier,
+) {
+    // Desktop has no bundled web view; offer to open the page in the system browser instead.
+    WebViewUnavailable(url = url, modifier = modifier)
+}