Re-enable publishing of the Material 2 module

The `material2` module was previously kept in source "for reference purposes"
only and excluded from publishing (it used `lib-conventions-without-publishing`).
However, the downstream `wordbook` app still depends on
`compose-multiplatform-html-unified-material2` (it uses components such as
`TopAppBarScaffold`, `RadioRow`, etc. that have no Material 3 equivalents yet),
so its `0.6.0-SNAPSHOT` dependency is currently unsatisfiable from any registry.

Switch `material2` to the publishing `lib-conventions` and restore the
`mavenPublishing` POM configuration (mirroring the `material3` module) so the
module is published again. It still compiles cleanly under Kotlin 2.3.20.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: ShreckYe

material2/build.gradle.kts

@@ -1,9 +1,9 @@
 import com.huanshankeji.cpnProject
 import com.huanshankeji.team.ShreckYe
-import com.huanshankeji.team.pomForTeamDefaultOpenSource
+import com.huanshankeji.team.setUpPomForTeamDefaultOpenSource
 
 plugins {
-    `lib-conventions-without-publishing`
+    `lib-conventions`
 }
 
 kotlin {
@@ -42,15 +42,15 @@ kotlin {
     }
 }
 
-/*
-publishing.publications.withType<MavenPublication> {
-    pomForTeamDefaultOpenSource(
-        project,
-        "Unified Compose Material 2 wrappers $FOR_COMPOSE_TARGETS_IN_TITLE",
-        "Unified Material Design 2 component wrappers $FOR_COMPOSE_TARGETS_IN_DESCRIPTION",
-        "2023"
-    ) {
-        ShreckYe()
+mavenPublishing {
+    pom {
+        setUpPomForTeamDefaultOpenSource(
+            project,
+            "Unified Compose Material 2 wrappers $FOR_COMPOSE_TARGETS_IN_TITLE",
+            "Unified Material Design 2 component wrappers $FOR_COMPOSE_TARGETS_IN_DESCRIPTION",
+            "2023"
+        ) {
+            ShreckYe()
+        }
     }
 }
-*/