android: share a note with a group

The Share sheet lists groups after people, shows a group share as its name and
how many are in it, and shares through the FFI's ShareTarget.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/ffi/src/lib.rs

@@ -43,8 +43,9 @@ use inkwell_core::sync::blobs::BlobStore;
 use inkwell_core::sync::{client, compat, engine, push, sharing, state};
 
 use models::{
-    patch_from, BodyItem, BodyTag, ClientUpdate, Identity, Label, Member, Note, NoteDraft,
-    NoteEdit, NoteQuery, NoteShare, ProbeResult, RevokeOutcome, SyncOutcome, SyncStatus,
+    patch_from, BodyItem, BodyTag, ClientUpdate, Directory, Identity, Label, Note, NoteDraft,
+    NoteEdit, NoteQuery, NoteShare, ProbeResult, RevokeOutcome, ShareTarget, SyncOutcome,
+    SyncStatus,
 };
 
 uniffi::setup_scaffolding!();
@@ -612,13 +613,13 @@ impl Inkwell {
     // The Share dialog asks the server directly (#5175). Unlinked, each answers
     // `NotLinked`, which the dialog turns into "sharing needs a server".
 
-    /// Everyone on the instance a note can be shared with.
-    pub async fn share_directory(&self) -> Result<Vec<Member>, CoreError> {
+    /// Everyone on the instance a note can be shared with, and every group.
+    pub async fn share_directory(&self) -> Result<Directory, CoreError> {
         self.credentials()?;
-        let members = sharing::directory(&self.db)
+        let directory = sharing::directory(&self.db)
             .await
             .map_err(CoreError::network)?;
-        Ok(members.into_iter().map(Member::from).collect())
+        Ok(directory.into())
     }
 
     /// Who this note is shared with.
@@ -630,15 +631,15 @@ impl Inkwell {
         Ok(shares.into_iter().map(NoteShare::from).collect())
     }
 
-    /// Share with one member at "view" or "edit", or change their permission.
+    /// Share with a person or a group at "view" or "edit", or change their permission.
     pub async fn share_note(
         &self,
         note_id: String,
-        user_id: String,
+        target: ShareTarget,
         permission: String,
     ) -> Result<Vec<NoteShare>, CoreError> {
         self.credentials()?;
-        let shares = sharing::share(&self.db, &note_id, &user_id, &permission)
+        let shares = sharing::share(&self.db, &note_id, &target.into(), &permission)
             .await
             .map_err(CoreError::network)?;
         Ok(shares.into_iter().map(NoteShare::from).collect())