improved type inference in plugin

site/src/jsMain/kotlin/ReferencePage.kt

@@ -170,16 +170,9 @@ fun ReferencePage() {
 }
 
 // --- helpers (mirror IDE provider minimal renderers) ---
-private fun typeOf(t: MiniTypeRef?): String = when (t) {
-    is MiniTypeName -> ": " + t.segments.joinToString(".") { it.name } + if (t.nullable) "?" else ""
-    is MiniGenericType -> {
-        val base = typeOf(t.base).removePrefix(": ")
-        val args = t.args.joinToString(", ") { typeOf(it).removePrefix(": ") }
-        ": ${base}<${args}>" + if (t.nullable) "?" else ""
-    }
-    is MiniFunctionType -> ": (..) -> .." + if (t.nullable) "?" else ""
-    is MiniTypeVar -> ": ${t.name}" + if (t.nullable) "?" else ""
-    null -> ""
+private fun typeOf(t: MiniTypeRef?): String {
+    val s = DocLookupUtils.typeOf(t)
+    return if (s.isEmpty()) "" else ": $s"
 }
 
 private fun signatureOf(fn: MiniFunDecl): String {