feat(core,app,android,ios): rename a share

ShareStore::rename changes only the name; the id that the catalog, watch
state and offline files are keyed by stays the same. Sync carries the
change as it does any other change to the share's register. The desktop
renames in the share's row. The phones rename from the share's menu.
Before, the name given at add time was permanent short of removing the
share.

crates/pstr-android/src/lib.rs

@@ -1386,6 +1386,14 @@ impl AndroidEngine {
         Ok(share_record(share))
     }
 
+    /// Call a share something else; see `ShareStore::rename`.
+    pub fn rename_share(&self, share_id: String, name: String) -> Result<ShareRecord, BridgeError> {
+        self.store
+            .rename(&share_id, &name)
+            .map(share_record)
+            .map_err(BridgeError::from_display)
+    }
+
     pub fn remove_share(&self, share_id: String) -> Result<(), BridgeError> {
         let _publication = self.share_publication.lock();
         let catalog = self.catalog.lock();