adopt two-step NIP-29 group creation with confirmation

crates/nip29/src/protocol.rs

@@ -155,9 +155,9 @@ impl GroupId {
             .tag_maybe(previous)
     }
 
-    pub fn create_group(&self, metadata: &GroupMetadata, previous: Option<Tag>) -> EventBuilder {
+    pub fn create_group(&self, previous: Option<Tag>) -> EventBuilder {
         EventBuilder::new(Kind::GroupCreateGroup, "")
-            .tags(self.metadata_tags(metadata))
+            .tag(self.h_tag())
             .tag_maybe(previous)
     }
 
@@ -435,6 +435,36 @@ impl GroupMetadata {
     }
 }
 
+/// Input for creating a group: access flags are presence-only per NIP-29.
+#[derive(Debug, Clone, Default)]
+pub struct GroupCreateOptions {
+    pub name: String,
+    pub about: Option<String>,
+    pub picture: Option<String>,
+    pub private: bool,
+    pub closed: bool,
+    pub restricted: bool,
+    pub hidden: bool,
+    pub custom_id: Option<String>,
+    pub parent: Option<GroupId>,
+}
+
+impl GroupCreateOptions {
+    pub(crate) fn metadata(&self, name: String) -> GroupMetadata {
+        GroupMetadata {
+            name: Some(name),
+            picture: self.picture.clone(),
+            about: self.about.clone(),
+            private: self.private,
+            restricted: self.restricted,
+            hidden: self.hidden,
+            closed: self.closed,
+            parent: self.parent.clone(),
+            ..Default::default()
+        }
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct GroupCandidate {
     pub key: GroupKey,